| 单词 | ovum |
| 例句 | Lanning considered, “If you had all your equipment—the brain, the skeleton, the ovum, the proper hormones and radiations—say, two months.” I, Robot 1950-12-02T00:00:00Z The Life Cult often supported itself on the ovum of its devotees, and the Harvesters were always buying. Ship Breaker 2010-05-01T00:00:00Z It is no longer necessary to guess about the storage of insecticides in the eggs of birds, which obviously lend themselves to this kind of observation more readily than the mammalian ovum. Silent Spring 1962-09-27T00:00:00Z The sharp smell of iodine from the algae, and the lime smell of calcareous bodies and the smell of powerful protean, smell of sperm and ova fill the air. Cannery Row 1945-01-01T00:00:00Z He’d rather focus his care and attention on an object billions of miles away than an ovum nearby. Review: In Search of Intelligent Life and a Willing Sperm Donor 2018-03-07T05:00:00Z Are your spermatozoa wagging their flagella as if they can’t wait to get to that ovum – or listlessly floating around like dead tadpoles in a poorly executed classroom experiment? The rise of Big Sperm: does the tech world have the answer to our semen crisis? 2019-07-07T04:00:00Z Ohio’s abortion bill approvingly singles out as worthy of insurance coverage a “procedure for an ectopic pregnancy, that is intended to reimplant the fertilized ovum into the pregnant woman’s uterus.” The Messiness of Reproduction and the Dishonesty of Anti-Abortion Propaganda 2019-05-17T04:00:00Z The images of nebulae, comets and star clusters are enclosed in circles or ovals, evoking not only the lens of the telescope but also more inward views: ova, or perhaps Petri dishes. Before 'Hidden Figures,' there were the Harvard Computers. Now their work has inspired this art 2017-05-04T04:00:00Z The oversized ovum, laid on the island of Madagascar, is believed to date back before the 17th century. Mammoth elephant bird egg nets $100,000 bid at auction 2013-04-24T14:43:00Z “Richard, I don’t think Jeff meant — ” “No, no, it’s interesting,” he said, springing into a description of how the prongs were sperm attacking the ovum. Barneys Remakes Itself for the New New York 2012-12-13T15:14:47Z Supine ova: How biologists order eggs sunny side up. Style Invitational Week 1205: Here, at least, you can take a do-over 2016-12-08T05:00:00Z Let us take a ride, For truly, sir, thy life is incomplete ’Til viridescent ovum thou hast tried Together with a slice of glaucous meat! Style Invitational Week 1332: Call them Spellimericks 2019-05-16T04:00:00Z The “incompetent cervix” joins a number of curious obstetric diagnoses: the “inhospitable uterus”, “hostile uterus”, “hostile cervical mucus”, “blighted ovum”. 'I felt I was being punished for pushing back': pregnancy and #MeToo 2018-03-17T04:00:00Z He is sure one motile guy, Got to reach that ovum with an X or a Y. Style Invitational Week 1239: MASH 3 — combine two movie titles 2017-08-03T04:00:00Z Rather, after trying and failing at different hustles, and like so many others in this movie — who sell suits and snake oil, human ova and baby formula — she now has something of exchange value. ‘Stonewalling’ Review: A Young Woman’s Exchange Value 2023-03-09T05:00:00Z A female has a system “developed to produce ova” while a male has a system “developed to fertilize” that ova. New law requires Kansas to reverse gender change for trans people in state records, state AG says 2023-06-26T04:00:00Z A woman is someone whose system “is designed to produce ova,” while a male only is someone with a system “designed to fertilize the ova of a female.” Kansas’ attorney general is moving to block trans people from changing their birth certificates 2023-06-24T04:00:00Z A woman is someone whose system “is designed to produce ova,” while a male is only someone with system “designed to fertilize the ova of a female.” Kansas’ attorney general is moving to block trans people from changing their birth certificates 2023-06-23T04:00:00Z The bill defines female as having XX chromosomes, and a reproductive and endocrine system that produces or would produce ova, or eggs. Montana governor signs law to define ‘sex’ as only male or female 2023-05-22T04:00:00Z Serial hermaphroditism, where the gonad can switch from producing sperm to ova, may also be seen in some species. Fundamentals of Biology 2015-01-01T00:00:00Z This species naturally self-fertilizes, meaning that pollen encounters ova within the same flower. Concepts of Biology 2013-04-25T00:00:00Z While sperm and ova matter, they are not the entirety of biology and don’t tell us all we need to know about sex, especially human sex. Here’s Why Human Sex Is Not Binary 2023-05-01T04:00:00Z “Female” is defined as someone “whose biological reproductive system is developed to produce ova,” while “male” refers to those “whose biological reproductive system is developed to fertilize the ova of a female.” Kansas kicks off push to define ‘woman,’ as red states seek to shield single-sex spaces 2023-02-23T05:00:00Z It says females have a reproductive system “developed to produce ova,” while males have one “developed to fertilize the ova.” States’ push to define sex decried as erasing trans people 2023-02-15T05:00:00Z It is a common misnomer to refer to a woman’s gametic cell as an egg or ovum, but this is impossible. Fundamentals of Biology 2015-01-01T00:00:00Z Serial hermaphroditism, in which the gonad can switch from producing sperm to ova, is also found in some crustacean species. Concepts of Biology 2013-04-25T00:00:00Z There are those, politicians, pundits and even a few scientists, who maintain that whether our bodies make ova or sperm are all we need to know about sex. Here’s Why Human Sex Is Not Binary 2023-05-01T04:00:00Z But the fact that the woman produced ova did not necessarily mean she was a source of life. Abortion and authoritarianism: Why women's freedom threatens male supremacy 2022-10-23T04:00:00Z In fish, this occurs when sperm swim through the water to find the ovum. Biology for AP Courses 2022-06-09T00:00:00Z A secondary oocyte must be fertilized by the male gamete before it becomes an “ovum” or “egg.” Fundamentals of Biology 2015-01-01T00:00:00Z These reactions, involving enzymes from the acrosome, allow the sperm plasma membrane to fuse with the egg plasma membrane and permit the sperm nucleus to transfer into the ovum. Concepts of Biology 2013-04-25T00:00:00Z That human sex rests on a biological binary of making either sperm or ova underlies all these claims. Here’s Why Human Sex Is Not Binary 2023-05-01T04:00:00Z At this moment, the oocyte has become an ovum, the female haploid gamete. Anatomy and Physiology 2013-06-19T00:00:00Z The fusion of these two membranes creates an opening through which the sperm nucleus is transferred into the ovum. Biology for AP Courses 2022-06-09T00:00:00Z The meiotic division is arrested in metaphase II. Fertilization triggers completion of the second meiotic division and the result is one ovum and an additional polar body. Fundamentals of Biology 2015-01-01T00:00:00Z The ban in Utah, where Ms. Baker lives, for example, frames abortion in the context of a “human pregnancy after implantation of a fertilized ovum,” which would exclude state jurisdiction over stored embryos. Infertility Patients and Doctors Fear Abortion Bans Could Restrict I.V.F. 2022-07-05T04:00:00Z Scientifically speaking, animals with the capacity to produce ova are generally called “female” and sperm producers “male.” Here’s Why Human Sex Is Not Binary 2023-05-01T04:00:00Z How does the diploid secondary oocyte become an ovum—the haploid female gamete? Anatomy and Physiology 2013-06-19T00:00:00Z This species naturally self-fertilizes, such that pollen encounters ova within individual flowers. Biology for AP Courses 2022-06-09T00:00:00Z Regarding the oft-debated assertion that full personhood exists at conception, consider this hypothetical situation: A healthy adult person stands before you with a fertilized ovum, a small blob of cells, cupped in one hand. Opinion | The abortion debate ignores the trauma of adoption 2022-05-24T04:00:00Z The Oklahoma measure defines fertilisation as the "fusion of a human spermatozoon with a human ovum". Oklahoma passes bill banning most abortions after conception 2022-05-19T04:00:00Z For example, in many mammal species, ova producers do most of the infant care. Here’s Why Human Sex Is Not Binary 2023-05-01T04:00:00Z Thus, the ovum can be thought of as a brief, transitional, haploid stage between the diploid oocyte and diploid zygote. Anatomy and Physiology 2013-06-19T00:00:00Z And he disputes that the bill would newly criminalize some aspects of in vitro fertilization, pointing to state law that already grants rights to an “in vitro fertilized human ovum.” Louisiana debates murder charge for women who get abortions 2022-05-12T04:00:00Z The document defines “sex” as biological sex; “female” as “an individual whose biological reproductive system is developed to produce ova;” “woman” and “girl” as “human females,” and “mother” as a “parent of the female sex.” Pressure to define ‘woman’ puts Democrats in a political quandary 2022-04-10T04:00:00Z The second was what's called a "blighted ovum" where a gestational sac was found, but no embryo was developing. 'I. Am. So. Sorry': Talking about my miscarriages 2021-10-22T04:00:00Z In the Czech language, the ending "-ova" is added to all surnames for women, so Mr Novak's daughter becomes Ms Novakova. Czech women win MPs' backing for non-gendered surnames 2021-06-02T04:00:00Z Right before the ova would be released from the ovary, they are harvested using ultrasound-guided oocyte retrieval. Anatomy and Physiology 2013-06-19T00:00:00Z Newsom said victims may not learn for many years if they were subjected to the illegal use or implantation of sperm, ova or embryos in assisted reproductions. Laws aid sexual assault victims, those hurt by other crimes 2020-09-29T04:00:00Z A “male” is defined as “an individual whose biological reproductive system is developed to fertilize the ova of a female.” Pressure to define ‘woman’ puts Democrats in a political quandary 2022-04-10T04:00:00Z That the single zygote cell formed when a microscopic sperm cell fertilizes an ovum is as much a person as you and me. Opinion | The party of McConnell, in the age of Trump, stands for nothing 2020-09-22T04:00:00Z She gives the example of ova, which are 80,000 times bigger than sperm. 'Vagina is not a rude word': the scientist fighting to empower women, one word at a time 2020-02-20T05:00:00Z The meds listed in the law prevent pregnancy in the first place, blocking the sperm from entering the ovum. What civil liberties? Kentucky's medieval abortion law amounts to state-sanctioned rape 2019-12-10T05:00:00Z But flowers, which contain both kinds of germ cells—pollen and ova—form from active somatic tissue at the tips of growing stems. Meet the monkeyflower, a weed that may hold the key to zebra stripes and other biological mysteries 2019-08-29T04:00:00Z “What does a blighted ovum even mean?” she asks. Please, doctor, don't call my lost baby a 'product of conception' | Katy Lindemann 2018-10-11T04:00:00Z As they scroll through online profiles of potential egg donors, Rachel cracks that it’s like “eBay for ova.” Film Review: A very intimate quest shown in ‘Private Life’ 2018-10-01T04:00:00Z “People like you don’t have long careers in your field. I have a job for you cleaning my fish tank when that lil job is ova @natalieweiner” After moving on from domestic-violence case, Seahawks’ Frank Clark takes a big step back 2017-05-10T04:00:00Z Republican Rep. Curt Nisly’s bill defines human physical life as beginning when a human ovum is fertilized by a human sperm and says the state has an interest in protecting life. Abortion ban bill won’t be heard in Indiana House committee 2017-01-26T05:00:00Z After careful study, it all — forgive me — boils down to four factors: preparation, heat-application method, cool-down period and the ovum itself. A hard-boiled detective story: What’s the best way to boil an egg? 2016-09-14T04:00:00Z Now, with an eye on past discoveries and persistent puzzles, The Most Perfect Thing reveals what it is like to become a bird — from nascent ovum to shelled egg and beyond. Ornithology: Oology unshelled : Nature : Nature Publishing Group 2016-04-12T04:00:00Z A two-foot-long sea cucumber, kin to sea stars, shoots thousands of ova into the current to spawn en masse. 2 Countries Reveal How Divided the World Is on Climate Change 2015-11-16T05:00:00Z In its 18 December ruling, the court said: "The mere fact that a parthenogenetically-activated human ovum commences a process of development is not sufficient for it to be regarded as a human embryo." European court clears way for stem-cell patents 2014-12-17T05:00:00Z "The mere fact that a parthenogenetically-activated human ovum commences a process of development is not sufficient for it to be regarded as a 'human embryo'," the court ruled. EU's top court opens door to some stem cell patents 2014-12-18T05:00:00Z What if I decide not to use my “viable” ova? Yes, I froze my eggs, but am I a victim of a new fertility racket? 2014-10-18T04:00:00Z He writes clearly, with accuracy and wit, about the ovum's development in the bird's ovary and its journey through the oviduct. Ornithology: Oology unshelled : Nature : Nature Publishing Group 2016-04-12T04:00:00Z That was the case with Morozova, the godmother of countless Russian and Eastern European women’s players, the -ova generation. From East to West, Cultivating Change on the Grass Courts 2014-07-05T04:00:00Z Your bill broadly defines abortion to include “drugs or devices used to prevent the implantation of a fertilized ovum.” A letter to an Ohio legislator who is playing with women's lives 2014-06-14T04:00:00Z Then he stopped to pose with the recipient of an office prize — a “stuffed ovary” that vaguely resembled a stuffed, oval-shaped animal — and which read “ova achievers.” Obama Effect Inspiring Few to Seek Office 2014-04-14T00:10:50Z In 2001, researchers combined ingredients from healthy eggs with the eggs of infertile women and fertilized the merged ova with sperm. FDA weighs evidence on producing 'three-parent' embryos 2014-02-25T22:03:51Z The patent application, filed more than five years ago, also covers use of the technique to screen sperm and ova for in vitrofertilization. Seven days: 4–10 October 2013 2013-10-09T17:20:17.157Z When Tilly extracted the cells, they had indeed matured into what at least appeared to be fully mature ova. Fertility Breakthroughs Are Bringing New Life into the World 2013-05-31T23:50:30Z A microscopic view of sperm fertilising an ovum. The internet is a dangerous wild west of DIY-assisted conception 2013-04-29T18:49:25Z In vitro fertilization, even fertilization of a woman’s ova with her husband’s sperm, is forbidden by church teaching, yet Catholics pursue those procedures nonetheless. The Catholic Church needs a sex talk 2013-03-11T21:37:34Z Identical Twins, twins which show identical inborn characters, both having come presumably from the same ovum. Being Well-Born An Introduction to Eugenics 2012-05-22T15:16:53.140Z You know who you are, the same ones that would come ova and have my pops tie your tie before every school dance and interview.” The Lede Blog: George Zimmerman's Disparaging Remarks About Mexicans on MySpace 2012-05-02T23:07:37Z They are extremely interesting to watch, though, if they are accidentally introduced into a hatching trough containing trout ova, they will destroy the eggs. Old Flies in New Dresses How to Dress Dry Flies with the Wings in the Natural Position and Some New Wet Flies 2012-04-02T02:00:23.697Z Between the met� were columns supporting the ova, egg-shaped balls, and Delphin�, or dolphins, each seven in number, one of which was put up for each circuit made in the race. Walks in Rome 2012-03-31T02:00:36.010Z Applied to those ova which segment uniformly, and which have little or no food yelk embedded in their protoplasm. Webster's Unabridged Dictionary 2012-03-24T02:00:23.513Z They are then known as egg cells or ova. Being Well-Born An Introduction to Eugenics 2012-05-22T15:16:53.140Z The hollow globe or sphere formed by the arrangement of the blastomeres on the periphery of an impregnated ovum. Webster's Unabridged Dictionary (2nd 100 Pages) 2012-03-24T02:00:19.387Z This fly never eats; the male, after impregnating two or three females, dies; and the latter, having deposited their ova in the nostrils of the sheep, also soon perish. Sheep, Swine, and Poultry Embracing the History and Varieties of Each; The Best Modes of Breeding; Their Feeding and Management; Together with etc. 2012-03-21T02:00:35.167Z In diphtheritic ulcerations, and in endometritis due to decomposing remains of the ovum, the load condition is often complicated by the invasion of the neighboring tissues. A System of Practical Medicine by American Authors, Vol. I Volume 1: Pathology and General Diseases 2012-03-17T02:00:54.097Z Supposedly, because the ovary was bigger and more resource rich than the sperm, it meant there were many tiny sperm actively competing for a large, resource rich ovum. Raising Darwin's Consciousness: An Interview with Sarah Blaffer Hrdy on Mother Nature 2012-03-16T18:15:03.113Z Each ovum finally enters on a series of cell-divisions forming a mass of smaller and smaller cells which gradually assumes the form of a hollow sphere like the parent colony. Being Well-Born An Introduction to Eugenics 2012-05-22T15:16:53.140Z That stage in the development of the ovum in which the outer cells of the morula become more defined and form the blastoderm. Webster's Unabridged Dictionary (2nd 100 Pages) 2012-03-24T02:00:19.387Z Germs are visible in the ovum before fecundation; in these germs the very primordia of future organization can be distinguished. Curiosities of Medical Experience 2012-03-09T03:00:20.410Z Remak showed that after differentiation of the cells of the ovum into the several germinal layers, those from one layer could not serve to originate the cells belonging to another layer. A System of Practical Medicine by American Authors, Vol. I Volume 1: Pathology and General Diseases 2012-03-17T02:00:54.097Z This was demonstrated by Oscar Hertwig from observation of the ova of starfishes. Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z This would afford abundant opportunity for alcohol to act directly on the spermatozoon or the ovum. Being Well-Born An Introduction to Eugenics 2012-05-22T15:16:53.140Z One of the ova or eggs of a fish. Webster's Unabridged Dictionary (2nd 100 Pages) 2012-03-24T02:00:19.387Z Leeches are oviparous, and their ova are discharged in one involucre near the surface and margin of pools, and are hatched by the heat of the sun. Curiosities of Medical Experience 2012-03-09T03:00:20.410Z He attributed these to the fact that no two ova, no two spermatozoa, can be identical, since the process of nutrition cannot be absolutely alike. Herbert Spencer 2012-02-29T03:00:20.773Z The ovum absorbs moisture by osmosis and enlarges, and about the twelfth day after the germ-nuclei have begun to divide, the Morula, or hollow ball of cells, called also the Blastodermic Vesicle, is formed. Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z The fact that they are invariably of the same sex is a strong reason for believing that sex was already developed in the fertile ovum and consequently in the resulting blastomeres from that ovum. Being Well-Born An Introduction to Eugenics 2012-05-22T15:16:53.140Z A small, clear space in the segments of the ovum, the precursor of the nucleus. Webster's Unabridged Dictionary (2nd 100 Pages) 2012-03-24T02:00:19.387Z An enigmatical structure, the “yolk-nucleus” of many ova, has been frequently regarded as a structure of considerable metabolic importance, e.g. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 8 "Cube" to "Daguerre, Louis" 2012-01-31T03:00:17.257Z Most ova are very minute cells, often microscopically minute, and a spermatozoon may be only 1/100,000th of the ovum's size—inconceivably minute, but yet exceedingly real and potent. Herbert Spencer 2012-02-29T03:00:20.773Z The spermatozoa carry the infection to the maternal ovum. Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z And it is a very significant fact that while the ovum and spermatozoon are very unequal in size themselves, the chromosomes of the two germ-cells are of the same size and number. Being Well-Born An Introduction to Eugenics 2012-05-22T15:16:53.140Z The germinal membrane in an ovum, from which the embryo is developed. Webster's Unabridged Dictionary (2nd 100 Pages) 2012-03-24T02:00:19.387Z It is hardly possible to ascertain how many of these ova are capable of fecundation. Principles of Political Economy, Vol. II 2012-01-25T03:00:34.150Z In the majority of cases, we admit, the reproductive cells are not to be seen in early segregation, and the continuous lineage from the fertilised ovum cannot be traced. Herbert Spencer 2012-02-29T03:00:20.773Z It was formerly thought that primary abdominal pregnancy is quite common; that is, that the ovum is implanted on some organ within the abdomen itself, apart from the uterine adnexa. Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z Note that while only a small proportion of the cytoplasm passes into this tiny cell, its chromatin content is as great as that of the ovum. Being Well-Born An Introduction to Eugenics 2012-05-22T15:16:53.140Z One of the segments first formed by the division of the ovum. Webster's Unabridged Dictionary (2nd 100 Pages) 2012-03-24T02:00:19.387Z This was that the so-called ova of Flustra had the power of independent movement by means of cilia, and were in fact larvæ. Charles Darwin: His Life in an Autobiographical Chapter, and in a Selected Series of His Published Letters 2012-01-22T03:00:19.733Z In the majority of cases, the germ-cells are seen as such after considerable differentiation has gone on, and although they are linear descendants of the ovum, their special lineage cannot be traced. Herbert Spencer 2012-02-29T03:00:20.773Z If the connection between the foetus and the tube-wall is only partly severed, the ovum remains in the tube, and the maternal hemorrhage goes on. Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z Or such a cell may combine with an ovum carrying the defective X, also producing a female but one who although of normal color vision herself, like her mother, is a carrier of the defect. Being Well-Born An Introduction to Eugenics 2012-05-22T15:16:53.140Z The ovum in this situation is liable to apoplexy, forming tubal mole. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 "Gyantse" to "Hallel" 2011-12-26T03:00:11.613Z This snake contained 22 ova averaging 56 � 23 mm. Amphibians and Reptiles of the Rainforests of Southern El Peten, Guatemala 2011-12-25T03:00:10.957Z Mature ova or spermatozoa will not normally divide if left to themselves, but that is because they are specialised to secure amphimixis, not because their powers are in any way declining or impoverished. Herbert Spencer 2012-02-29T03:00:20.773Z Fecundation of the ovum rarely occurs in the uterus, but ordinarily in the Fallopian tube, according to the general opinion of physiologists. Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z This means that the zygote or fertile ovum contains double the number of chromosomes possessed by either gamete, and that, moreover, each tissue-cell of the new individual will contain this dual number. Being Well-Born An Introduction to Eugenics 2012-05-22T15:16:53.140Z The ovum may be destroyed or may continue to develop. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 "Gyantse" to "Hallel" 2011-12-26T03:00:11.613Z But to catch the perfect insects themselves, I adopt the following plan: Anobium striatum commonly deposits its ova in beech wood, and is more partial, apparently, to that than any other wood. Book Collecting: A Guide for Amateurs 2011-12-21T03:00:41.820Z The latter develop in manifold variety into skin and nerve, muscle and blood, gut and gland; they differentiate, and may lose almost all protoplasmic likeness to the mother ovum. Herbert Spencer 2012-02-29T03:00:20.773Z After fecundation the ovum is pushed on into the uterus in from five to seven days, where it fastens to the wall and develops. Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z After ova are fertilized a three and one-half to four-month period of development begins which varies somewhat depending on the temperature. Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia) 2011-12-17T03:00:17.963Z During the growth of the ovum nourishment is supplied from the contents of the cells immediately surrounding the egg-cell, as in the development of the ovum of Pinus and other conifers. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 "Gyantse" to "Hallel" 2011-12-26T03:00:11.613Z In all probability it is, above all, essential, in order that it should occur, that one or more spermatozoa should penetrate the ovum. Fruits of Philosophy A Treatise on the Population Question 2011-12-03T03:00:10.910Z But the reproductive cells are set apart; they take no share in the differentiation, but remain virtually unchanged, continuing unaltered the protoplasmic tradition of the original fertilised ovum. Herbert Spencer 2012-02-29T03:00:20.773Z It is as much a murder, as such, to unjustly destroy this microscopic fecundated ovum as it is to kill the child after birth. Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z Sizes of ova vary irrespective of size of female and stage of embryonic development. Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia) 2011-12-17T03:00:17.963Z Surrounding the pitted wall of the ovum there is a definite layer of large cells, no doubt representing a tapetum, which, as in cycads and conifers, plays an important part in nourishing the growing egg-cell. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 "Gyantse" to "Hallel" 2011-12-26T03:00:11.613Z In the human female the ovum is extremely minute, so as only to be visible with the aid of a lens. Fruits of Philosophy A Treatise on the Population Question 2011-12-03T03:00:10.910Z In the development of the threadworm of the horse according to Boveri, the very first cleavage of the ovum establishes a distinction between somatic and reproductive cells. Herbert Spencer 2012-02-29T03:00:20.773Z The ovum may be stopped in any one of the three parts of the tube, and we find Interstitial, Isthmic, or Ampullar Pregnancy. Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z Lengths of ova ranged from 22 to 51 millimeters in May to 35 to 49 millimeters in July and August. Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia) 2011-12-17T03:00:17.963Z Wherever the fertilized ovum remains and implants its villi the tube becomes turgid and swollen, and the abdominal ostium gradually closes. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 "Gyantse" to "Hallel" 2011-12-26T03:00:11.613Z This membrane, with the albuminous fluid it contains and the animalcule in the center of it, constitutes the ovum or egg. Fruits of Philosophy A Treatise on the Population Question 2011-12-03T03:00:10.910Z In every development a portion of this specific germ-plasm, which the parental ovum contains, is unused in the upbuilding of the offspring's body, and is reserved unchanged to form the germ-cells of the next generation.... Herbert Spencer 2012-02-29T03:00:20.773Z The interstitial form, that is, where the ovum is arrested in that part of the tube which passes through the wall of the uterus itself, is the rarest of the tubal pregnancies. Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z In almost every instance the ova in the right uterus outnumber those in the left. Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia) 2011-12-17T03:00:17.963Z When neither of these occurrences has taken place the ovum continues to grow inside the tube, the rupture of the distended tube usually taking place between the sixth and the tenth week. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 7 "Gyantse" to "Hallel" 2011-12-26T03:00:11.613Z Second, the ovum is impregnated while it remains in the ovary. Fruits of Philosophy A Treatise on the Population Question 2011-12-03T03:00:10.910Z From this speculation Spencer passes to a brief consideration of what occurs before and during the fertilisation of the ovum. Herbert Spencer 2012-02-29T03:00:20.773Z Mammalian ova, owing to an almost complete lack of yolk, are all small. Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z Gravid females usually do not feed so frequently or so much as other snakes, because they tend to become inactive as the ova develop. Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia) 2011-12-17T03:00:17.963Z Female, 38989, ova to 3 mm., fat, 115 gm., old brood patch, Camp 1, July 8. Vertebrates from the Barrier Island of Tamaulipas, M?xico 2011-11-15T03:00:17.973Z Such a discharge of ova occurs in the lower animals at the time of heat or rut, and in women during menstruation. Fruits of Philosophy A Treatise on the Population Question 2011-12-03T03:00:10.910Z Before fertilisation is accomplished the nucleus of the ovum normally divides twice in rapid succession, and gives off two abortive cells—known as polar bodies—which come to nothing. Herbert Spencer 2012-02-29T03:00:20.773Z Man has probably 16 chromosomes in the somatic cell, and the mature male and female germ cells in man contribute eight chromosomes each to the nucleus of the impregnated ovum. Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z The lower hemisphere of the ovum is Female in inherency. Feminism and Sex-Extinction 2011-11-11T03:00:29.100Z Specimen: ♀, 38950, ova to 2 mm., moderately fat, weight not recorded, 5 P old, Camp 2, July 9. Vertebrates from the Barrier Island of Tamaulipas, M?xico 2011-11-15T03:00:17.973Z I think no one can be disposed to maintain that the animalcul� merely reaches the surface of the ovum and thus impregnates it. Fruits of Philosophy A Treatise on the Population Question 2011-12-03T03:00:10.910Z In the history of the male element or spermatozoon, there is an analogous reduction, so that when spermatozoon and ovum unite in fertilisation the normal number is restored. Herbert Spencer 2012-02-29T03:00:20.773Z If the fecundated ovum is blocked or held in the Fallopian tube, the embryo grows where the ovum stops, and we have a case of Ectopic Gestation. Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z Such a sperm-cell penetrating the ovum, and developing laterally, further differentiates this into anterior, posterior and lateral areas. Feminism and Sex-Extinction 2011-11-11T03:00:29.100Z Camp 2, July 9; ♀, 38933, ova to 1 mm., no weight recorded, Camp 2, July 8. Vertebrates from the Barrier Island of Tamaulipas, M?xico 2011-11-15T03:00:17.973Z But possibly some may contend that its sole office is to stimulate the ovum, and in this way set going that train of actions which are essential to impregnation. Fruits of Philosophy A Treatise on the Population Question 2011-12-03T03:00:10.910Z A parthenogenetic ovum gives off one polar body—though without reduction in the number of chromosomes—and then proceeds by asexual multiplication or ordinary cell division to build up a body. Herbert Spencer 2012-02-29T03:00:20.773Z Dr. Lusk said: " … The frequent discovery of the dead ovum in a tube when there has been no suspicion of pregnancy shows the difficulty of a diagnosis." Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z As regards inheritance, the maternal ovum comprises, I believe, the potential of the whole body, with the exception of the brain, the spinal-cord and the spinal nerves. Feminism and Sex-Extinction 2011-11-11T03:00:29.100Z Extrauterine migration of ova results usually in a more even distribution of eggs in the oviducts. Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz 2011-10-01T02:00:30.200Z At each menstrual period, a Graafian vesicle becomes enlarged, bursts, and lets the ovum which it contains escape into the Fallopian tube, along which it passes to the uterus. Fruits of Philosophy A Treatise on the Population Question 2011-12-03T03:00:10.910Z Under normal conditions this wall is smooth, or nearly so, but probably there are upon it some slight irregularities or projections which are sufficient to catch the ovum when it enters the uterine cavity. Embryology The Beginnings of Life 2011-09-12T02:00:28.483Z Then commonly the entire ovum comes away with the gauze, or what remains of it is taken out with a curette. Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z The question eagerly discussed was whether there might be origin of life, without development from germ, seed, or ovum. The Relations of Science and Religion The Morse Lecture, 1880 2011-09-11T02:00:11.613Z A, of Helix; B, of Eolis; a, ova; b, developing spermatozoa; c, common efferent duct. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5 "Gassendi, Pierre" to "Geocentric" 2011-09-02T02:00:20.450Z It is essentially necessary for fecundation that the spermatozoa should come into actual contact with the ovum. Fruits of Philosophy A Treatise on the Population Question 2011-12-03T03:00:10.910Z If the ovum at this stage be looked at from above, the embryonic area appears as a small shaded oval. Embryology The Beginnings of Life 2011-09-12T02:00:28.483Z A few cells have also an outer envelope or membrane, and this part is well developed in the ovum. Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z For these reasons, ova and spermatozoa can arise only when the germplasm which has been handed on from the original nucleus to certain cells is able to overcome the histogenous plasm of these cells. The Biological Problem of To-day Preformation Or Epigenesis? The Basis of a Theory of Organic Development 2011-08-29T02:01:04.170Z It would seem as if a current of fresh water were essential to the ova, and that that is why the opening of the nest is so carefully kept from becoming choked up. Wild Life in a Southern County 2011-08-04T02:00:27.037Z Pritchard says this animal, whose name is Trachelius ovum, is an inhabitant of stagnant bog water, and has been found encysted. Marvels of Pond-life A Year's Microscopic Recreations 2011-08-01T02:00:12.067Z Germ-cells, which are derived from the tissues of a female animal, are termed “ova.” Embryology The Beginnings of Life 2011-09-12T02:00:28.483Z How is the extremely complex human body with its various physical characteristics built up from the nucleus of a fecundated cell, the ovum? Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z In this case, also, there is no sexual affinity between the pollen and the ova. The Biological Problem of To-day Preformation Or Epigenesis? The Basis of a Theory of Organic Development 2011-08-29T02:01:04.170Z The turbot, for instance, must deposit millions of minute glassy ova or the species would become extinct. Household Administration Its Place in the Higher Education of Women 2011-07-20T02:00:13.547Z It is more than likely that the creatures which Digby saw were entomostraca introduced in the form of ova which, unless a good microscope be used, are quite invisible. The Seven Follies of Science [2nd ed.] A popular account of the most famous scientific impossibilities and the attempts which have been made to solve them. 2011-06-30T02:00:34.290Z When these are derived from a female they are termed “ova”; when from a male they are termed “sperms.” Embryology The Beginnings of Life 2011-09-12T02:00:28.483Z When the head penetrates the ovum, the tail is detached and rejected. Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z I start from the conception that the ovum is an organism that multiplies by division into numerous organisms like itself. The Biological Problem of To-day Preformation Or Epigenesis? The Basis of a Theory of Organic Development 2011-08-29T02:01:04.170Z But, as far as is known, the female never willingly spawns except in the close presence of a male, and the male never fertilises the ova except in the close presence of a female. The Descent of Man and Selection in Relation to Sex Volume II (1st Edition) 2011-06-27T02:01:01.007Z She rejected Planned Parenthood’s request to block a portion of the law requiring that women be told that “human physical life begins when a human ovum is fertilized by a human sperm.” Indiana Law Defunding Planned Parenthood Is Rejected by Judge 2011-06-25T04:17:50Z The result of this is that half the number of chromosomes in the ovum are lost. Embryology The Beginnings of Life 2011-09-12T02:00:28.483Z Normal twins may arise from the fertilisation of one ovum and of two distinct ova. Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z The issuing ovum does not destroy the ectoderm cells as it passes out, but squeezes them together round the aperture it makes. Freshwater Sponges, Hydroids & Polyzoa 2011-06-25T02:00:17.833Z The ova are fertilised during the act of deposition and are not subsequently tended by either parent. The Descent of Man and Selection in Relation to Sex Volume II (1st Edition) 2011-06-27T02:01:01.007Z Twins of the same sex, especially those who resemble one another closely, are usually born from a single ovum. Psychotherapy 2011-06-19T02:00:20.053Z This process being carried still further allows the ovum to sink deeper and deeper into the lining membrane of the uterus. Embryology The Beginnings of Life 2011-09-12T02:00:28.483Z Triplets may arise from one, two, or three ova. Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z "Such proportion as the seed sustains to the mature plant, the ovum to the living, moving creature, you will tell me—" Dr. Baxter was saying, when she again lent attention to his dissertation. Jessamine A Novel 2011-06-15T02:00:24.413Z The ova are fertilised immediately after being deposited, and when this process lasts for several days, as in the case of the salmon,30 the female, during the whole time, is attended by the male. The Descent of Man and Selection in Relation to Sex Volume II (1st Edition) 2011-06-27T02:01:01.007Z Of animal ova, how exceedingly few become animals, in proportion to those that do not; and that are wasted, if this be waste! The Plurality of Worlds 2011-06-01T02:00:23.787Z The uterine wall, after this embedding of the ovum within it, undergoes a remarkable growth at this position, concerning which a word must be said. Embryology The Beginnings of Life 2011-09-12T02:00:28.483Z There is a divergence of opinion, however, as to the origin of a composite monster in the single ovum. Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z This influence is most strongly exerted when the maternal ancestor is the one affected, for to her is committed the development of the ovum prior to conception and of the child subsequently. Degeneracy Its Causes, Signs and Results 2011-05-02T02:00:17.657Z Em�bry, an immature organism, especially in the earlier stages of development from the fertilized ovum onwards. The New Gresham Encyclopedia Volume 4, Part 2: Ebert to Estremadura 2011-04-14T02:00:56.200Z Trout ova in ice were sent to Australia, where, after incubation had been suspended for a hundred days, when placed in running water, the fish came into the world strong and healthy. Famous Men of Science 2011-03-08T03:00:49.717Z These outgrowths grow into the uterine tissue around the ovum, and they allow of blood circulating between them. Embryology The Beginnings of Life 2011-09-12T02:00:28.483Z Dareste is of the opinion that the fusion of two separate ova is impossible. Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z Three years later he killed the animal and found the ova had developed into twisted, club-shaped, hollow sacs. Degeneracy Its Causes, Signs and Results 2011-05-02T02:00:17.657Z For these minute creatures appeared almost every where, and in places where it seemed impossible that their ova should be found. The Religion of Geology and Its Connected Sciences 2011-02-28T03:00:28.890Z Its website boasts of the good looks and health of the male sperm donors and the female ovum donors; it shows houses and hospitals in peaceful grounds with a swimming pool and high security. Thailand probes baby sales ring 2011-02-25T10:20:40Z That original single cell is termed, in animal Embryology, the “fertilised ovum.” Embryology The Beginnings of Life 2011-09-12T02:00:28.483Z The blastomeres in the human ovum may perhaps be injured in part by toxins from the mother, or they may be defective through disease in the ovum or the spermatozoon. Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z The same cause produces also premature extrusion of ova. Degeneracy Its Causes, Signs and Results 2011-05-02T02:00:17.657Z The small ova are crowded beneath the dorsal part of the valves. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 6 "English Language" to "Epsom Salts" 2011-02-19T03:00:59.807Z An abundant, grayish yellow, odorless exudate was found between the ovum and the inner wall of the uterus. Contagious Abortion of Cows 2011-02-14T03:00:33.157Z These began in 1875 and following years with a careful examination of the behaviour of the germinal vesicle in the maturation and fertilization of the ovum. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z Twins from a single ovum are always of the same sex, and they are not easily distinguished one from the other. Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z Ichneumon flies lay their eggs either in the larvae or ova of other insects, and the parasites destroy their host. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 10 "Echinoderma" to "Edward" 2011-01-19T03:00:19.027Z Afterwards sufficient females for obtaining ova were procured. The Descent of Man and Selection in Relation to Sex, Vol. I 2011-01-17T03:00:49.523Z In some cases, though, the unfertilised ovum itself is believed to be affected. The inheritance of obesity: Thanks, Dad 2011-01-06T10:47:49Z The reproductive cell produced by the male is called the spermatozoon, and that produced by the female, the ovum. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z The elder Saint-Hilaire thought that composite monsters arise from the fusion of two impregnated ova, but this opinion is now generally rejected. Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z The ova often serve as a nucleus for urinary calculi. Encyclopaedia Britannica, 11th Edition, Volume 3, Slice 7 "Bible" to "Bisectrix" 2010-12-20T17:12:05.780Z But differences of this nature, it may be presumed, are directly connected with the act of reproduction or with the development of the ova. The Descent of Man and Selection in Relation to Sex, Vol. I 2011-01-17T03:00:49.523Z The collection of ova may be carried on more or less throughout the year. Butterflies and Moths (British) It has been observed in some eggs that a membrane, formed round the ovum immediately after the entrance of the spermatozoon, prevents the entrance of others. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z Composite terata in every instance arise from a single ovum. Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z God might just as easily have ordained that the ovum should be complete in itself, and that, without any intervention or co-operation, at appointed intervals the mother should bring forth her offspring. What a Young Husband Ought to Know This marvellous complexity of an osmotic growth may be compared with another fact, the ontogenetic development of the ovum, a single cell which under favourable conditions of environment may evolve into a most complicated organism. The Mechanism of Life In nearly all cases we must expect to find ova on the food plants of the respective species, but at times, especially with certain moths, we may come across them in the most unlikely spots. Butterflies and Moths (British) These experiments, if authenticated, suggest that ova have the power of development, but are not able to exercise it in their normal surroundings. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z There is a connection between menstruation and the production of the human ovum. Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z The only condition upon which the ovum may remain in the womb is by possessing life. What a Young Husband Ought to Know In the preparation one may see the distance between the two poles slowly increase, the poles gradually separating from one another just as do the centrosomes of an ovum during karyokinesis. The Mechanism of Life Such occurrences, however, we must regard as accidental and comparatively rare, and therefore we confine our searchings for ova to the food plants of the species we require. Butterflies and Moths (British) In the cleavage of the ovum the first two of these methods of division are found, but probably not the third. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z If, during this stage, the ovum is impregnated, pregnancy begins, and menstruation ceases until some time after childbirth. Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z The ovum may remain for a period, and the spermatozoa that seek the ovum may enter, but neither may tarry unless each yields itself to the other in that mysterious union which results in life. What a Young Husband Ought to Know The substance of the child is other than that of the ovum, and the substance of the adult is not that of the child. The Mechanism of Life The ova or larv� are placed on the plant, the whole or part of which is then covered with a bag or 'sleeve' of gauze. Butterflies and Moths (British) Gametogeny is the name applied to the formation of the gametes, i.e. of the ova and spermatozoa. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z If the ovum is not impregnated, the material that made the uterine mucous membrane thick during the first week of menstruation degenerates and passes off, constituting the menstrual flow. Essays In Pastoral Medicine 2012-03-05T03:00:09.993Z Great changes are to be wrought not only in the ovum, but the enlarging life and new necessities are to be met by corresponding changes in the womb itself. What a Young Husband Ought to Know The ova and the spermatozoa dehisce into the body cavity and pass to the exterior through the nephridia. Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 3 "Borgia, Lucrezia" to "Bradford, John" The empty shells of ova are in themselves sometimes interesting objects, especially when they illustrate some peculiar instinct on the part of the parent. Butterflies and Moths (British) For Parthenogenesis. instance, it has been said that parthenogenetic ova form only one polar body. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z If the idioplasm of the fertilizing cell were to pass through the membrane about the ovum by osmosis, its organized structure would be lost.—Trans. A Mechanico-Physiological Theory of Organic Evolution Within this is the decidua reflex, the membrane of the womb, which extended itself and grew around the ovum, completely enclosing it. What a Young Husband Ought to Know The developing ova are attached by little stalks to the walls of these pouches. Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 3 "Borgia, Lucrezia" to "Bradford, John" It will be remembered, also, that many of the Lepidoptera pass the winter in the egg state, and search may be made for ova when time permits. Butterflies and Moths (British) On further inquiry and examination it was found that the ova of many other animals presented a cleavage essentially similar to that of Peripatus. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z There is no possibility that sperm and ova can escape by these tubes not in company with coelomic fluid. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 7 "Cerargyrite" to "Charing Cross" When the ovum is quickened, every fibre of being thrills with a new purpose. What a Young Husband Ought to Know Each ovum is surrounded by a follicular epithelium which is nourished by numerous blood-vessels, and which penetrates into the surface of the ovum in numerous folds. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" From this time till late in the summer the ova of various species are being deposited, the average period from laying to hatching being from two to three weeks. Butterflies and Moths (British) As a general rule the o�cyte divides unequally twice, giving rise to two small cells called polar bodies, and to the ovum. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z The spermatozoa enter it and pass through its walls and traverse a minute duct formed of two accessory cells, and finally enter the ripe ovum. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 7 "Cerargyrite" to "Charing Cross" Others have held that the season of the year when the ovum is produced and fertilized determines the result. What a Young Husband Ought to Know Some of the water-beetles, also, as the Dyticidæ, are amphibious, and in the evening quit their lakes and pools, and, flying in the air, transport the minute ova of fishes to distant waters. Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology Then, during the autumn, when the leaves of food plants are turning brown and crisp, ova are still being laid, but these remain unchanged till the new buds of the following spring are bursting. Butterflies and Moths (British) They may therefore be regarded as abortive ova. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z Special sacs developed from the intersegmental septa lodge the developing ova and sperm. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 7 "Cerargyrite" to "Charing Cross" The ovum or egg of the mother is so small that two hundred and forty of them would need to be laid side by side in order to make a row one inch long. What a Young Husband Ought to Know In 1479 the sovereignty of Ferdinand and Isabella over the Canaries was established by the treaty of Alca�ova, between Portugal and Castile. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 2 "Camorra" to "Cape Colony" One difficulty of the ova collector lies in the fact that many insects lay on the upper branches of large trees. Butterflies and Moths (British) The nucleus of the male gamete is not called the male pronucleus, as would be expected, that term being reserved for the second nucleus which appears in the ovum after fertilization. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z No separate spermathecae or septal chambers for the development of the ova and sperm. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 7 "Cerargyrite" to "Charing Cross" Another theory which has received considerable attention is that the ova, liberated from month to month, alternate in gender. What a Young Husband Ought to Know They explained the inroad of frogs on natural principles, probably referring to the immense abundance ordinarily of the ova and tadpoles of these creatures compared with that of the adults. The Origin of the World According to Revelation and Science Each batch of ova should be carefully examined with a view to knowing them by sight on a future occasion. Butterflies and Moths (British) In the parthenogenetic ova of certain insects, e.g. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z A female taken from a dead tree in the cocoa may have been just finishing nesting activities, judging from the size of the ova. Birds from North Borneo University of Kansas Publications, Museum of Natural History, Volume 17, No. 8, pp. 377-433, October 27, 1966 Passing through and above the cervix, it continues to move about with great activity until it finds an ovum, which it seeks with avidity. What a Young Husband Ought to Know Because its existence is ova before it comes to life. The Handbook of Conundrums In the next chapter some hints will be given concerning the management of ova and the rearing of the larv� from the time of hatching. Butterflies and Moths (British) As soon as the spermatozoon has conjugated with the ovum, a second nucleus appears in the ovum. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z The invariable death of the fish in the same almost ripe condition leads to the conclusion that under normal conditions the fish dies after the mature ova have been discharged. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 1 "Edwardes" to "Ehrenbreitstein" Now, the human ovum or egg consists of a vitellus or yolk, which is covered by a similar membrane, known as the vitelline. What a Young Husband Ought to Know You're a sperm—an ovum—and if you don't leave the parent body you die. The Colonists This occupation is generally far more productive to the entomologist than searching for ova. Butterflies and Moths (British) The first change the zygote undergoes in all animals is what is generally called the segmentation or cleavage of the ovum. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z Frost and I just finished a series of tests with native ova and human sperm. The Test Colony When this ovum or egg has been fertilized or impregnated, remarkable changes take place. What a Young Husband Ought to Know One day after the fertilized ovum starts dividing—" "And I ran it myself every day for over a week. One Way We have seen that ova and larv� may be obtained in greater or less abundance at all times of the year, so variable are the seasons of the different butterflies and moths. Butterflies and Moths (British) So the process continues for some time until the ovum becomes possessed of a large number of nuclei, all of which have proceeded from the original nucleus by a series of binary fissions. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z The flow of life in some of these coves and estuary-like indentations is marvellous, the fish coming in egg-laden, and looking for streams of fresh water in which to deposit their ova. With the World's Great Travellers, Volume 1 A royal place is speedily prepared for the safety, nurture and development of the ovum. What a Young Husband Ought to Know Well, I was showing you the ovary in which are many ova. Almost a Woman Applying this principle to ova, we store them in airy and light places, protected from the direct rays of the sun, and avoid handling and rough treatment of any kind. Butterflies and Moths (British) It is characteristic of this kind of ovum that there is always a row of nuclei, called the yolk-nuclei, placed in the denser yolk immediately adjacent to the blastoderm. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z For the theory of epigenesis obviously required mysterious formative principles, and equally mysterious powers of recollection and recapitulation, which impelled the undifferentiated ovum substance into the final form, precisely like that of its ancestors. Naturalism And Religion In the highest forms of life the ovum reaches its maturity in a department of the mother's body which is called the ovary. What a Young Husband Ought to Know As the girl nears the age of fourteen, these ova start to grow and once a month one ripens and is thrown out of the ovary. Almost a Woman Chip boxes are, as a rule, very good and very convenient receptacles for ova. Butterflies and Moths (British) The dead mosquito falls upon the water, which thus becomes infected, and hence the ova reach the human stomach. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z By taking the above precautions you will prevent the ovum from making its nest in the lining of the womb. Family Limitation While the ovum is passive, the sperm of the male is characterized by great activity and remarkable vitality. What a Young Husband Ought to Know I told you of the germ or ovum that is produced by the ovary of the woman. Almost a Woman The ova of Brassic� may be found on the leaves of cabbages in every kitchen garden, also on the nasturtium, during May and July. Butterflies and Moths (British) The beginning of this period is precise and definite—it is the completion of the fertilization of the ovum, in which the life of the individual has its start. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z Any attempt to interfere with the development of the fertilized ovum is called an abortion. Family Limitation The ovum of the female and the sperm of the male become microscopic. What a Young Husband Ought to Know The ovum will now fasten itself to the walls of the uterus and grow into the little child. Almost a Woman Looking at Plate I, you will see that the woman's body provides the egg or ovum. The Sex Side of Life An Explanation for Young People The ovum of the fowl is 30 mm. in diameter, that of the frog 1�75 mm., while the ova of the rabbit and Amphioxus have a diameter of �l mm. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z The ova were flesh-coloured, but they had been dried and then placed in spirits. A Monograph on the Sub-class Cirripedia With Figures of all the Species. From the moment that the spermatozo�n penetrates the ovum and unites with it, life is present, and the destruction of that life is murder. What a Young Husband Ought to Know Well, if you do not like to use the word egg we can say ovum, which, you know, is the Latin word for egg. Almost a Woman Ovary, in which grows the ovum or egg. The Sex Side of Life An Explanation for Young People The food-yolk is deposited in the ovum as a result of the vital activity of its protoplasm, while the ovum is still a part of the ovary of the parent. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z I have noticed a specimen including mature ova, with a capitulum under half an inch long. A Monograph on the Sub-class Cirripedia With Figures of all the Species. However, our cell stores are useless if they lack ova to fertilize. The Women-Stealers of Thrayx Or we may call the ovum the germ, which means the primary source. Almost a Woman Fallopian tube, which carries the ovum to the uterus. The Sex Side of Life An Explanation for Young People It is an inert substance which is used as food later on by the developing embryo, and it acts as a dilutant of the living matter of the ovum. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z I have often seen trout that have been reared from ova, and whose age was consequently known, and have closely observed their mouths. A Danish Parsonage If the whole ovum, about 1⁄150 in diameter, were all gemmules, the number would be sufficient to last, at this rate, one per second for 5,600 years! Was Man Created? The ovum or germ is a very tiny thing, so small that it cannot be seen without a microscope; 240 laid side by side would make only one inch in length.” Almost a Woman Uterus or Womb, in which the egg or ovum grows into a baby. The Sex Side of Life An Explanation for Young People In normal fertilization, as a rule, only one spermatozoon fuses with the ovum. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 2011-02-06T03:00:53.093Z In many cases the apparent tumor is a blighted ovum which has failed to develop, but has grafted itself on its more fortunate twin and from it has drawn its nourishment. Special Report on Diseases of Cattle Fish are subject to a mouldy-looking parasite belonging to the Saprolegniei, and a similar form attacks the ova of toads and frogs. Fungi: Their Nature and Uses That ovum of itself could never become a new being. Almost a Woman Often the unfertilized ovum is carried away with it, but the two things do not necessarily happen at the same time. The Sex Side of Life An Explanation for Young People In some species the eggs are carried about by the father—the male sea-horse, for instance, has a pouch developed for this purpose; in other cases the male incubates, or cares for the ova. The Truth About Woman A post-mortem examination would probably have disclosed an imperfectly formed ovary incapable of bringing ova to maturity. Special Report on Diseases of Cattle Thus the "mulberry-mass" into which a fertilized ovum of a vertebrate animal first resolves itself, soon begins to exhibit a difference between the outer and inner parts answering to the difference of circumstances. Essays: Scientific, Political, & Speculative, Vol. I I have already said, the female germ-cell is also known as the ovum, or egg. Treatise on the Diseases of Women But the perils and vicissitudes encountered in procuring the ova are little realized by most people. Lippincott's Magazine, September, 1885 Thus in the Surinam toad the male spreads the ova on the back of the female, where skin cavities form in which the tadpoles develop. The Truth About Woman Sometimes a monstrosity is owing to the inclosure of one ovum in another while the latter is still but a soft mass of cells and can easily close around the first. Special Report on Diseases of Cattle Why two ova, similarly exposed in the same pool, should become the one a fish, and the other a reptile, it cannot tell us. Essays: Scientific, Political, & Speculative, Vol. I One Female Element; Many Male Elements.—The human ovum is often said to be a miniature of the egg of the common fowl, although there are some quite marked differences between the two. Treatise on the Diseases of Women One is an ovum, and these are the principle the mother gives to the future child. Almost A Man In addition to their minuter size they differ from the ova in their power of active movement. Mendelism Third Edition This mucus contains the Strongylus micrurus, which can be detected, or their ova observed, under a low power of the microscope. Special Report on Diseases of Cattle The starting-point, not only of every higher animal or plant, but of every clan of organisms which by fission or gemmation have sprung from a single organism, is always a spore, seed, or ovum. Essays: Scientific, Political, & Speculative, Vol. I One Egg Discharged Each Month.—An ovum, or egg, is discharged during each menstrual period. Treatise on the Diseases of Women In this relation the spermatozoon of the man unites with the germ or ovum of the 17 woman and a new life is begun. Almost A Man Among animals the female contributes the ovum and the male the spermatozoon; among plants the corresponding cells are the ovules and pollen grains. Mendelism Third Edition Impregnation now takes place, and, with the development of the ova in the body, the tick takes an increased quantity of blood, so that in a few days it becomes very much larger. Special Report on Diseases of Cattle In its simplest and most unmistakable form, we see this in the early changes of an unfolding ovum of primitive type. Essays: Scientific, Political, & Speculative, Vol. I At just what time during this period the ovum is cast from the body is not definitely known, but it is generally thought to be toward the latter part. Treatise on the Diseases of Women It is the same power that enables the fertilized ovum to develop into an animal. Astounding Stories of Super-Science February 1930 The size of the ova varies enormously in different animals. Mendelism Third Edition Any man possesses at the very start of his life—that is, at the moment when the ovum and spermatozoön which are to produce him have united—numerous well-defined tendencies to future behavior. Introduction to the Science of Sociology After the fertilisation of the ovum, during pregnancy, that is to say, menstruation usually ceases until after the birth of the child, and often until the completion of lactation. The Sexual Life of the Child Part of an ovary, showing a ripe ovum, or egg, about to be cast off, as occurs at each menstrual period. Treatise on the Diseases of Women Archetypal resemblances of ova have been found, and such things as moths; but these are distinct and perfect in their kind. The Testimony of the Rocks or, Geology in Its Bearings on the Two Theologies, Natural and Revealed When this happens an ovum of any one of the four types has an equal chance of being fertilised by a spermatozoon of any one of the four types. Mendelism Third Edition One or two applications destroy all living creatures or their ova. "The Red Watch" With the First Canadian Division in Flanders In the fertilised ovum, it is supposed, the rudiment of sex already exists, likewise the rudiment of the reproductive gland, and the rudiments of the appropriate sexual characters. The Sexual Life of the Child This figure illustrates the course followed by an ovum. Treatise on the Diseases of Women Development.—The development of Balanoglossus takes place according to two different schemes, known as direct and indirect, correlated with the occurrence in the group of two kinds of ova, large and small. Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 2 "Baconthorpe" to "Bankruptcy" Her problem is to get the factor on which the quality depends into an ovum that carries also the factor for femaleness. Mendelism Third Edition And as the rose springs from the seed, so the horse develops from the ovum. The Heart of Nature or, The Quest for Natural Beauty In the interior of each follicle is an ovum. The Sexual Life of the Child During all these years the woman is capable of bearing children, because at each month there has been a fully developed ovum, or egg, ready to be fertilized. Treatise on the Diseases of Women These and the lampreys are the only fishes’ nests that I have observed, though the ova of some species may be seen floating on the surface. The Log of the Sun A Chronicle of Nature's Year We are led, therefore, to suppose that an ovum carrying the yellow factor is unproductive if fertilised by a spermatozoon which also bears this factor. Mendelism Third Edition And by virtue of the horse-spirit, the horse-ideal, by which all the innumerable particles of that ovum is actuated, it develops into a horse, and not into a donkey or a cow. The Heart of Nature or, The Quest for Natural Beauty Liégeois,55 in post-mortem examinations, twice found mature ova in girls two years of age. The Sexual Life of the Child In the third case, creative imagination, the ideal, a sketched construction, is the equivalent of the ovum; but it is evident that the plasticity of the creative imagination is much greater than that of instinct. Essay on the Creative Imagination The third, when abortion must take place, to expedite the separation of the ovum and free the contents of the womb. The Ladies Book of Useful Information Compiled from many sources But the ova do not grow large until the fish is mature; they wait until the fish has developed its strength, its bone, and muscle. The Renewal of Life; How and When to Tell the Story to the Young It is well known how Weismann was led, by his hypothesis of the continuity of the germ-plasm, to regard the germinal cells—ova and spermatozoa—as almost independent of the somatic cells. Creative Evolution Also, the burrow scooped out by salmon in which to deposit their ova. The Sailor's Word-Book An Alphabetical Digest of Nautical Terms, including Some More Especially Military and Scientific, but Useful to Seamen; as well as Archaisms of Early Voyagers, etc. Showing the mite, ova, empty shells and excrement. Essentials of Diseases of the Skin Including the Syphilodermata Arranged in the Form of Questions and Answers Prepared Especially for Students of Medicine The vesicle corresponds to the vesicle, or germinal spot, in the eggs of birds, and ovum of mammiferous animals. The $100 Prize Essay on the Cultivation of the Potato. Prize offered by W. T. Wylie and awarded to D. H. Compton. How to Cook the Potato, Furnished by Prof. Blot. Generally three or five of these ova develop at the same time, some in one oviduct, some in the other. The Renewal of Life; How and When to Tell the Story to the Young Next to the one-celled infusoria no phenomenon throws such direct light on our cellular psychology as the fact that the human ovum, like the ova of all other animals, is a single, simple cell. Freedom in Science and Teaching. from the German of Ernst Haeckel What was wanted was something to which the eggs, floating in the water, could attach themselves, and remain till they were developed beyond the state of ova. Faces and Places The region involved, itching, variable amount of irritation, and, above all, the presence of the pediculi and their ova. Essentials of Diseases of the Skin Including the Syphilodermata Arranged in the Form of Questions and Answers Prepared Especially for Students of Medicine Embryonic Development The first stage in the development of any animal is the tiny speck of plasm, hardly visible to the naked eye, which we call the ovum, or egg-cell. The World's Greatest Books — Volume 15 — Science That all life, even human, starts as a tiny ovum. The Renewal of Life; How and When to Tell the Story to the Young On the contrary, we now know that every cell does not necessarily originate from a cell, any more than that every organic individual originates from an ovum. Freedom in Science and Teaching. from the German of Ernst Haeckel This is what one physiologist says of the ovum which is being developed into a complex being. The Continental Monthly, Vol. 3, No. 1 January 1863 Devoted To Literature And National Policy By the impregnated female parasite, which penetrates the epidermis obliquely to the rete, depositing as it goes along ten or fifteen ova, forming a minute passage or burrow. Essentials of Diseases of the Skin Including the Syphilodermata Arranged in the Form of Questions and Answers Prepared Especially for Students of Medicine The amoeba represents the lowest animal, and, as we saw, the ovum in many cases resembles an amoeba. The World's Greatest Books — Volume 15 — Science From the inside of each ovary the tiny eggs, or ova, grow, just as the ovules grow in the plant ovary or seed-pod. The Renewal of Life; How and When to Tell the Story to the Young He meant “ova”; but the bishop insisted on the sheep; and the priest probably rubbed up his Latin grammar. Mediæval Wales Chiefly in the Twelfth and Thirteenth Centuries: Six Popular Lectures Here we perceive the resemblance between the ovum of the higher animals and the permanent structure of the lower animals. The Continental Monthly, Vol. 3, No. 1 January 1863 Devoted To Literature And National Policy Repeated washings with vinegar or dilute acetic acid, or with alkaline lotions, will free the hairs of the ova. Essentials of Diseases of the Skin Including the Syphilodermata Arranged in the Form of Questions and Answers Prepared Especially for Students of Medicine When the male germ has blended with the female in the ovum, the new cell slowly divides into two, with a very complicated division of the material composing its nucleus. The World's Greatest Books — Volume 15 — Science Each fertilizing cell is like an ovum, excepting that it is not so spherical and is lengthened into a sort of lash by which it can propel itself through the water. The Renewal of Life; How and When to Tell the Story to the Young Stages in the formation of the polar bodies in the ovum of a star-fish 125 34. Darwin, and After Darwin (Vol. 1 and 3, of 3) An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions The breeding of trout and salmon, and the artificial spawning and hatching of ova, are, however, an innovation of our own time. Amateur Fish Culture Treatment is entirely external, and consists of a preliminary soap-and-hot-water bath, an application, twice daily for three days, of a remedy destructive to the parasites and ova, and finally another bath. Essentials of Diseases of the Skin Including the Syphilodermata Arranged in the Form of Questions and Answers Prepared Especially for Students of Medicine Several of them were attended by drones, which deposit their ova in the cells of the working bees, some of them having the dress and general appearance of their victims. The Western World Picturesque Sketches of Nature and Natural History in North and South America Like the pollen of the flower, the fertilizing cells of the fish cannot act upon any ova but those of its own species. The Renewal of Life; How and When to Tell the Story to the Young The contents of an ovum in an advanced stage of segmentation, drawn in perspective 135 41. Darwin, and After Darwin (Vol. 1 and 3, of 3) An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions They will probably not harm adult fish, but they will destroy ova and fry. Amateur Fish Culture Treatment consists in the application of some remedy destructive to the pediculi and their ova. Essentials of Diseases of the Skin Including the Syphilodermata Arranged in the Form of Questions and Answers Prepared Especially for Students of Medicine Within the ovum there are taking place some of the most marvelous changes in the whole life history of the individual. The Biology, Physiology and Sociology of Reproduction Also Sexual Hygiene with Special Reference to the Male The ova of the frog develop in an ovary exactly as do the ova of a fish; they develop in the same way and at the maturity of the animal. The Renewal of Life; How and When to Tell the Story to the Young The argument from embryology must be taken to begin with the first beginning of individual life in the ovum. Darwin, and After Darwin (Vol. 1 and 3, of 3) An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions I have no doubt that an infinitely greater proportion of trout ova are eaten by the trout themselves than by grayling in rivers which contain both fish. Amateur Fish Culture In hairy individuals the malady is often persistent, due to the fact that ova have become attached to the hair and a new progeny soon hatched out. Essentials of Diseases of the Skin Including the Syphilodermata Arranged in the Form of Questions and Answers Prepared Especially for Students of Medicine The fertilized ovum makes a lodgment on the inner surface of the uterus or womb and begins immediately to absorb its nourishment from the maternal organism. The Biology, Physiology and Sociology of Reproduction Also Sexual Hygiene with Special Reference to the Male As the bird approaches maturity, one ovary and its oviduct enlarge, and the ova, which develop from the inside of the ovary just as the ovule develops inside the flower ovary, also become large. The Renewal of Life; How and When to Tell the Story to the Young Histologically the ovum, or egg-cell, is nearly identical in all animals, whether vertebrate or invertebrate. Darwin, and After Darwin (Vol. 1 and 3, of 3) An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions There are many of these in the British Isles, and nowadays eyed ova are packed and sent safely all over the country. Amateur Fish Culture The disease is readily cured, and, as soon as the parasites and their ova are destroyed, the itching and the secondary symptoms, as a rule, rapidly disappear. Essentials of Diseases of the Skin Including the Syphilodermata Arranged in the Form of Questions and Answers Prepared Especially for Students of Medicine The human ovum, divided off from the maternal organism, is a minute globule of protoplasm, almost microscopic in size. The Biology, Physiology and Sociology of Reproduction Also Sexual Hygiene with Special Reference to the Male It is hardly necessary to add that the fertilizing cells in the male bird have an origin similar to that of the ova. The Renewal of Life; How and When to Tell the Story to the Young But even with respect to this matter of an enveloping membrane, there is no essential difference between an ovum of the lowest and an ovum of the highest animals. Darwin, and After Darwin (Vol. 1 and 3, of 3) An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions Collecting the ova of wild trout is also an operation of some difficulty, and lays the beginner open to much more disappointment than if he deals with eyed ova purchased from a reliable establishment. Amateur Fish Culture Now Loeb and others have succeeded in certain forms—even in a vertebrate like the frog—in inducing development in unimpregnated ova. Science and Morals and Other Essays The spermatozoa frequently remain several days in the organs of the female before the ovum is found and fertilized. The Biology, Physiology and Sociology of Reproduction Also Sexual Hygiene with Special Reference to the Male They are perfect so far as the ovum is concerned, but lacking fertilization they cannot continue their development. The Renewal of Life; How and When to Tell the Story to the Young Moreover this membrane, when present, is usually provided with one or more minute apertures, through which the spermatozoön passes when fertilizing the ovum. Darwin, and After Darwin (Vol. 1 and 3, of 3) An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions It is of the greatest importance that everything should be ready for the ova long before they are expected, as hurry and new apparatus are likely to cause failure. Amateur Fish Culture Loeb thinks that in causing this alteration it sets up the segmentation of the ovum. Science and Morals and Other Essays The sacrifice of the mother in producing the ovum is inconsiderable, but the production of the ovum is simply the first step in the sacrifice which the maternal organism makes. The Biology, Physiology and Sociology of Reproduction Also Sexual Hygiene with Special Reference to the Male In the larger ones, as the horse and the cow, but one ovum generally develops, though the development of two is not uncommon. The Renewal of Life; How and When to Tell the Story to the Young What we have now to understand by the ovum, the egg, or the egg-cell, is the microscopical germ which I have just described. Darwin, and After Darwin (Vol. 1 and 3, of 3) An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions When the young fish hatch out, the trays which contained the ova can be removed, and the young fish kept in the boxes. Amateur Fish Culture It is quite evident that an artificial stimulus can in certain cases set up segmentation, but never can it cause the fertilisation of the ovum. Science and Morals and Other Essays The spermatozoon may be described as the male sexual cell whose function is to fertilize the female ovum. The Biology, Physiology and Sociology of Reproduction Also Sexual Hygiene with Special Reference to the Male The lowest monad has a mouth and means for propagating its kind, which do not belong to the primitive ovum of any higher animal. A Theory of Creation: A Review of 'Vestiges of the Natural History of Creation' But, as we have likewise seen, when the ovum ceases to resemble these organisms, by taking on its higher degree of functional capacity, it is no longer able to multiply itself in this manner. Darwin, and After Darwin (Vol. 1 and 3, of 3) An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions Notice is usually sent a day or two before the ova are despatched from fish cultural establishments, so the amateur has no excuse for not being absolutely ready for their reception. Amateur Fish Culture Above all we are entitled to ask why there are any effects, or even why there is any ovum or any spermatozoon or curious physiological investigator, to give the artificial stimulus. Science and Morals and Other Essays But, remember, O dealer in phrases sonorous, So daintily chosen, so tunefully matched, Though you soar with the wings of the cherubim o'er us, The ovum was human from which you were hatched. The Book of Humorous Verse Of course, the immature ovum, arrested in its development, could not form a more perfect being than its parent. A Theory of Creation: A Review of 'Vestiges of the Natural History of Creation' The sperm-cell, or spermatozoön, is seen in the act of penetrating the ovum. Darwin, and After Darwin (Vol. 1 and 3, of 3) An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions While under water well-eyed ova will stand a good deal of gentle tumbling about, but if dropped into the water from even a little height the concussion is likely to kill them. Amateur Fish Culture It is even possible, as Loeb maintains, that this differentiation is present in the unsegmented ovum, in which case the facts to be detailed become still more remarkable and significant. Science and Morals and Other Essays With many woman," says Dr. Stockham in her Tokology, "the ovum passes off within twenty-four or forty-eight hours after menstruation begins. Searchlights on Health: Light on Dark Corners A Complete Sexual Science and a Guide to Purity and Physical Manhood, Advice To Maiden, Wife, And Mother, Love, Courtship, And Marriage Recent accounts show, that the dust collected from the atmosphere at sea, many miles from land, generally contains some of these dried animalcules and their ova. A Theory of Creation: A Review of 'Vestiges of the Natural History of Creation' At the same time its tail begins to disappear, and the enlarged head proceeds to make its way directly towards the nucleus of the ovum which, as before stated, is now called the female pronucleus. Darwin, and After Darwin (Vol. 1 and 3, of 3) An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions He says that the shrimps eat only the dead ova, and never touch the living ones. Amateur Fish Culture Abortion is, strictly speaking, the expulsion of the impregnated ovum at any period from the date of impregnation until the foal can survive out of the womb. Special Report on Diseases of the Horse Their distribution at first perplexed me much, as their ova are not likely to be transported by birds, and they are immediately killed by sea-water, as are the adults. On the Origin of Species by Means of Natural Selection or the Preservation of Favoured Races in the Struggle for Life. (2nd edition) Such are the ova of all animals; and both vegetable and animal tissues are entirely formed from them. A Theory of Creation: A Review of 'Vestiges of the Natural History of Creation' Therefore, where the parent-cell is an ovum, it follows from this view that all hereditary qualities of the future organism are potentially present in the ultra-microscopical structure of the chromatin fibres. Darwin, and After Darwin (Vol. 1 and 3, of 3) An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions Dead ova should be always removed at once, and the hatching trays should be gone over carefully once or twice a day to see if any are present in them. Amateur Fish Culture Inclosed ovum, or tumors of the fetus.—Tumors or diseased growths may form on any part of the foal, internal or external, and by their size impede or hinder parturition. Special Report on Diseases of the Horse Cumulus: a group or heap; as of cells in a developing ovum. Explanation of Terms Used in Entomology It is then shed not as a mere ovum, but as an animal nearly or wholly complete. A Theory of Creation: A Review of 'Vestiges of the Natural History of Creation' The general protoplasm of the ovum is becoming divided. Darwin, and After Darwin (Vol. 1 and 3, of 3) An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions Dead ova are easily recognized from the fact that they become opaque and white. Amateur Fish Culture In some cases what appears as a tumor is an imprisoned and undeveloped ovum which has grafted itself on the fetus. Special Report on Diseases of the Horse Egg: a simple cell, capable of fertilization, containing the germ, the food-yolk necessary for its nutriment, and a covering membrane: a single ovum or cell from an ovary: the first stage of the insect. Explanation of Terms Used in Entomology The ovum, when separated from the parent, is an entire animal only potentially; during its development, the essential parts which constitute the actual whole are produced. A Theory of Creation: A Review of 'Vestiges of the Natural History of Creation' But as in relation to this purpose the illustrations speak for themselves, I may now pass on at once to the history of embryonic development, which follows fertilization of the ovum. Darwin, and After Darwin (Vol. 1 and 3, of 3) An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions The thumb is placed over one end of the tube, and the other end brought directly over the dead ovum. Amateur Fish Culture All this suggests the development of extra parts from the same primary layer of the impregnated and developing ovum. Special Report on Diseases of the Horse Ex ova: from or out of the egg: applied to specimens that have been bred from the egg stage. Explanation of Terms Used in Entomology In the case of the polyps, we have only to suppose that the ovum remains connected with the parent being, till all, or nearly all, its essential parts are produced. A Theory of Creation: A Review of 'Vestiges of the Natural History of Creation' In the next sentence in the text the author does not distinguish the characters of the vegetable capsule from those of the ovum. The Foundations of the Origin of Species Two Essays written in 1842 and 1844 When the thumb is removed from the end of the tube held in the hand the water will rush up into the tube, carrying with it the dead ovum. Amateur Fish Culture Each barrel contains the ova of three hundred cod. The Land of the Long Night Female: designated by "O+" the astronomical sign for Venus: that sex in which the ova are developed. Explanation of Terms Used in Entomology Teacher—Yes, dear; ova refers to an egg. The New Pun Book There are in the germ and the ovum which constitute the inheritance of each individual, certain determinant elements. Human Traits and their Social Significance A form of fungus known as Byssus grows upon dead ova, and it is principally for this reason that they must be removed. Amateur Fish Culture For if two or more spermatozoa got into the same ovum a monstrosity would be apt to be the result. Woman Her Sex and Love Life Pronucleus: the nucleus of male and female elements, spermatozoa and ova, the union of which forms the nucleus of a fertilized ovum. Explanation of Terms Used in Entomology We find, therefore, the story told by the ovum written also in the rocks. Text Book of Biology, Part 1: Vertebrata Tapeworm.—The only sure sign of the presence of this parasite in the intestine is the passing from the bowels of some of its joints or ova. Papers on Health Birds of several kinds are also likely to cause great damage unless the ova and young fish are carefully guarded from their depredations. Amateur Fish Culture And as the spermatozoa carry in them the entire impress of the man, and the ova of the woman, they foretell us the fates of the future boy and girl. Woman Her Sex and Love Life Spermatozoön-zoa: the male cell or cells which, by uniting with the ova, fertilize them. Explanation of Terms Used in Entomology The next phase of development has an equally curious resemblance to and difference from what occurs in the case of the ova of animals which do not contain yolk. Text Book of Biology, Part 1: Vertebrata Adams, commenting on this, has in mind hydatids, but it is evident that both Hippocrates and his translator and critic have mistaken hydatidiform disease of the ovum for hydatid disease of the womb. Outlines of Greek and Roman Medicine In a short time, probably within a few days of receiving the ova, the amateur will find that the young fish are beginning to hatch out. Amateur Fish Culture But in the ovum that has been impregnated, and which is now called an embryo, a feverish activity commences. Woman Her Sex and Love Life I wish I knew something about biochemical embryology; but I read somewhere that ova are sterile, so our galaxy is an ovum. The Galaxy Primes Balfour, borrowing a mathematical technicality, suggested that the rate of segmentation in any part of an ovum varies inversely with the amount of yolk. Text Book of Biology, Part 1: Vertebrata The wide-awake, vibrating lifelike sperm plunges head first and bodily into the ovum. The Mother and Her Child They generally come out tail first, and in wriggling this about in their attempts to get further out, they propel the ovum about the bottom of the tray. Amateur Fish Culture If the ovum is in the Fallopian tube when the spermatozoön meets it, as is usually the case, it travels down to the uterus, and fixes itself there. Woman Her Sex and Love Life Schwann had therefore a good deal of exact knowledge to go upon in discussing the significance of the ovum for the cell-theory. Form and Function A Contribution to the History of Animal Morphology The fowl, on the contrary, has an enormous ovum, gorged excessively, with yolk, and as a consequence the chick is almost perfected when it is hatched. Text Book of Biology, Part 1: Vertebrata The blending of the sperm and ovum has been perfect, the division of the original body multitudinous. The Mother and Her Child Other appliances are necessary for hatching out the ova and for the young fish when first hatched. Amateur Fish Culture From the moment the spermatozoön has entered the ovum, a process of division or segmentation commences. Woman Her Sex and Love Life Either the ovum was a cell and the germinal vesicle its nucleus, or else the germinal vesicle was itself a cell within the larger cell of the ovum and the germinal spot was its nucleus. Form and Function A Contribution to the History of Animal Morphology In early spring the females are greatly distended with ova, and the greater portion of the ovary may, with advantage, be removed. Text Book of Biology, Part 1: Vertebrata This continues from puberty to menopause, each gland alternatingly ripening its ovum, only to lose it in the periodical phenomenon of menstruation, which is seldom interrupted save by that still more wonderful phenomenon of conception. The Mother and Her Child They are very easily made, and the ova hatch out well in them. Amateur Fish Culture From the placenta there is also reflected a membrane over the ovum, so as to give it additional protection. Woman Her Sex and Love Life Criticism of the Schwann-Schleiden theory from the zoological side was suggested by the study of the segmentation of the ovum—the developmental process in which the multiplication of cells is most easily observed. Form and Function A Contribution to the History of Animal Morphology In the ovary, the ova are formed, and grow to a considerable size. Text Book of Biology, Part 1: Vertebrata The fateful meeting of the sperm and the ovum takes place usually in the upper end of one of the fallopian tubes. The Mother and Her Child Though ova sometimes hatch out very successfully even when piled up in two or three layers, it is safer to have them in a single layer. Amateur Fish Culture While the manufacture of ova begins only at puberty, with menstruation, and closes at the menopause, the manufacture of the internal secretion lasts throughout the woman's entire life. Woman Her Sex and Love Life All animals develop from an ovum; it was his first task to discover whether the ovum was or was not a cell. Form and Function A Contribution to the History of Animal Morphology The ovum has, in fact, undergone cell division into a very large cell containing most of its substance, and a small protoplasmic pimple surrounding half of its nucleus. Text Book of Biology, Part 1: Vertebrata The fertilized ovum remains in the tube for about one week, when it slowly makes its way down into the uterus, all the 11while rapidly undergoing segmentation or division. The Mother and Her Child To these instructions I would add some for the amateur, who will probably deal with a comparatively small number of ova. Amateur Fish Culture For it is estimated that at birth each ovary contains about 100,000 ova; the majority of these, however, disappear so that at the age of puberty each ovary contains only about 30,000 ova. Woman Her Sex and Love Life He recognised the Keimfleck in the ova of many classes of animals from mammals to polyps. Form and Function A Contribution to the History of Animal Morphology Fertilization is effected by a spermatozoon meeting with the ovum. Text Book of Biology, Part 1: Vertebrata The storehouse for the seeds they call the 'ovary,' from the Latin ovum, an egg. Proserpina, Volume 1 Studies Of Wayside Flowers When the water is quite clear, and the ova clean, they may be caught in mid-water as they are sinking either in the hatching trays or in a cup. Amateur Fish Culture An ovum becomes mature, breaks through its Graafian follicle in the ovary and is set free. Woman Her Sex and Love Life But the ovum was not, in Schwann's view, a simple cell, for within it were contained yolk-granules, one set apparently containing a nucleus, the others not. Form and Function A Contribution to the History of Animal Morphology The differences are such as we may account for, not on the supposition that the rabbit's ovum never had any yolk, but that an abundant yolk has been withdrawn from it. Text Book of Biology, Part 1: Vertebrata The spermatozoon fertilises the ovum, introducing 2 chromosomes. The Outline of Science, Vol. 1 (of 4) A Plain Story Simply Told The thumb is then replaced over the end of the tube, which is lifted from the water with the ovum retained in it. Amateur Fish Culture The ovum dries up, or "dies," and either remains somewhere in the tube or womb or is removed from the latter with the menstruation, or mucous discharge. Woman Her Sex and Love Life According to his account the cells of the blastoderm are formed actually in the ovum. Form and Function A Contribution to the History of Animal Morphology Compare the process of fission in an amoeba with the segmentation of the ovum in amphioxus, pointing out the resemblances and differences between the two cases. Text Book of Biology, Part 1: Vertebrata The fertilised ovum, with 4 chromosomes, 2 of paternal origin and 2 of maternal origin. The Outline of Science, Vol. 1 (of 4) A Plain Story Simply Told Saprolegnia, known to fish culturists as "fungus," attacks both living or dead ova. Amateur Fish Culture Whatever part of the womb the ovum attaches itself to is stimulated to intense activity, to growth. Woman Her Sex and Love Life It happened that, some years before Schwann wrote, a good deal of work had been done on the minute structure of the ovum, particularly by Purkinje and von Baer. Form and Function A Contribution to the History of Animal Morphology The ova prey upon the adjacent cells as they develop. Text Book of Biology, Part 1: Vertebrata To begin with, there is in the ovum and early embryo no nervous system at all, and it develops very gradually from simple beginnings. The Outline of Science, Vol. 1 (of 4) A Plain Story Simply Told If the woodwork is properly varnished or charred, and the ova managed thoroughly, there should, however, be but little risk of fungus. Amateur Fish Culture The function of the Fallopian tubes or oviducts as they are sometimes called is to catch the ovum as it bursts through the ovary and to conduct it from the ovary into the uterus. Woman Her Sex and Love Life The ova of animals, the spores of plants, the isolated cells of lower organisms in general, all show the power of separate assimilation and development. Form and Function A Contribution to the History of Animal Morphology Not only in the frog's ovum, but in all vertebrata, two polar bodies are given off in this way before the sexual process occurs. Text Book of Biology, Part 1: Vertebrata Darwin called the pinhead brain of the ant the most marvellous atom of matter in the world, but the human ovum is more marvellous still. The Outline of Science, Vol. 1 (of 4) A Plain Story Simply Told The shells of the ova must be removed from the hatching trays. Amateur Fish Culture |
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