| 单词 | silicious |
| 例句 | As grass contains silicious, glassy particles, the higher crowns enable tooth wear to be less severe. Fossils hint at first grasslands 2012-07-25T15:40:56Z Each of these bodies is enclosed in a silicious case with an aperture at one end, whence its contained protoplasm issues, and, having so issued, assumes a spherical shape. The Contemporary Review, Volume 36, October 1879 2012-04-18T02:00:17.060Z Soluble silicates are mentioned here, in order that a more perfect understanding of the nature of silicious compounds may be obtained, by those who do not possess a scientific knowledge of chemistry. British Manufacturing Industries Pottery, Glass and Silicates, Furniture and Woodwork. 2012-02-26T03:00:18.883Z When burnt and ground, and mixed with a due proportion of silicious sand, it has been found to make a most superior kind of hydraulic cement or water lime. The History of Louisville, from the Earliest Settlement till the Year 1852 2012-02-04T03:00:17.917Z The addition of ground sherds or flint will have a contrary effect should the glaze peel or crack at the edges, as it may do on a very silicious body. Pottery, for Artists Craftsmen & Teachers 2011-12-10T03:00:15.097Z We consider they were in part fluor-spar, and in any event the third order embraced varieties of quartz, flint, and silicious material generally. De Re Metallica, Translated from the First Latin Edition of 1556 2011-11-16T03:00:21.977Z They had grown and multiplied until their stems fairly touched one another, forming a dense, impenetrable thicket of green, silicious tubes eight to twelve feet in length. Jungle Peace 2011-10-06T02:00:42.363Z Tripoli powder, extensively used for polishing, consists mainly of the silicious shells of Diatoms. Sea-Weeds, Shells and Fossils 2011-08-20T02:00:11.557Z Among this transported material I observed numerous small fragments of those agates, and other silicious minerals of the quartz family, which characterize the broad diluvial tracts about its sources and upper portions. Scenes and Andventures in the Semi-Alpine Region of the Ozark Mountains of Missouri and Arkansas 2011-07-10T02:00:18.883Z The material out of which the real meerschaum head is made, is dug in Spain, Portugal, and the ancient Thebes, and consists of a silicious clay, in chemical combination with water. The Student-Life of Germany 2011-07-03T02:00:09.143Z Assuming the latter case, then all of the necessary elements of cementation, i.e., vitriol, salt, and an aluminous or silicious element, are present. De Re Metallica, Translated from the First Latin Edition of 1556 2011-11-16T03:00:21.977Z Of these, the second or silicious group has precedence in point of time, beginning in the Early Cambrian, and continuing to the present. The Chain of Life in Geological Time A Sketch of the Origin and Succession of Animals and Plants 2011-06-01T02:00:24.880Z It is from their silicious shells that mineral acquires its use in the arts, as powder for polishing stones and metals. Sea-Weeds, Shells and Fossils 2011-08-20T02:00:11.557Z This is probably better adapted as a flux than even silicious sands; but it has not yet been brought to light at the lead-mines. Scenes and Andventures in the Semi-Alpine Region of the Ozark Mountains of Missouri and Arkansas 2011-07-10T02:00:18.883Z In Cochin China two pieces of bamboo are considered sufficient, the silicious character of the outside layer rendering it as good as native flint. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 4 "Finland" to "Fleury, Andre" 2011-03-20T02:00:30.697Z They had no smiths, supplying their place by a very considerable skill in the cleavage of silicious stones. Algic Researches, Comprising Inquiries Respecting the Mental Characteristics of the North American Indians, Vol. 1 of 2 Indian Tales and Legends 2011-02-04T03:00:18.247Z Its quality is determined by the greater or less proportion of silicious or gritty matter with which its fibres are associated. Asbestos Its production and use, with some account of the asbestos mines of Canada 2011-02-01T03:00:13.163Z Similar superficial deposits are met in the vicinity of Cienfuegos, and in other sections of the island, where the plain forms a piedmont adjacent to highlands composed of silicious rocks. The History of Cuba, vol. 1 Scattered along the shores of the river at this place, I observed large, angular masses of pudding-stone, consisting chiefly of silicious pebbles and sand, cemented by oxide of iron. Scenes and Andventures in the Semi-Alpine Region of the Ozark Mountains of Missouri and Arkansas 2011-07-10T02:00:18.883Z Changed "silicious" to "siliceous" on page 143: "filled with siliceous sand." The Eruption of Vesuvius in 1872 All around the sides are large masses of the silicious crust that have fallen from the rim. With the World's Great Travellers, Volume 2 It is evident that this will form a pozzuolanic cement if a suitable silicious material such as trass is added to the cement. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" We always remove it by sand and water—the coarser the sand the better; the finer, being more silicious, is more likely to cut. Blackwood's Edinburgh Magazine, Volume 62, No. 383, September 1847 Lime and barytes, both of which are afforded in plenty at the mines, might therefore be advantageously employed, when no sand or easy-melting silicious gravel could be obtained. Scenes and Andventures in the Semi-Alpine Region of the Ozark Mountains of Missouri and Arkansas 2011-07-10T02:00:18.883Z In the Rennes basin limestones—often dolomitic—are associated with quartzites and conglomerates; silicious limestones also occur in the Sarthe region. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 1 "Calhoun" to "Camoens" And the hard, silicious earth, in its comfortable repose, might be understood to say, I am an aboriginal inhabitant, and what do these transient fellows want? Villa Eden: The Country-House on the Rhine They are usually made from a silicious limestone containing magnesia, and are comparatively lightly burned. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" An exceptionally rich copper mine exists at Arghana Maden, but it is very imperfectly worked; galena mineral oil and silicious sand are also found. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 4 "Diameter" to "Dinarchus" When, therefore, silicious sand can be obtained, it will be found a more powerful flux to lead-ashes than either gravel, lime, spars, or any other substance, if we except the fluor spar. Scenes and Andventures in the Semi-Alpine Region of the Ozark Mountains of Missouri and Arkansas 2011-07-10T02:00:18.883Z Blast furnaces of large size, built of brick, have been constructed for treating the richest and more silicious ores of Rio Tinto, and 105 the Rio Tinto Company has introduced converters at the mine. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 3 "Convention" to "Copyright" Its fibrous roots give some cohesion to the silicious soil. The Lay of Havelok the Dane There are, however, many silicious 654 substances occurring abundantly in nature which can thus be used. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 6 "Celtes, Konrad" to "Ceramics" It apparently belongs to the silicious ware of the north. Ancient Pottery of the Mississippi Valley Fourth Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1882-83, Government Printing Office, Washington, 1886, pages 361-436 Its compactness, superior softness, specific gravity, and coloring matter, distinguish it from silicious sinter. Scenes and Andventures in the Semi-Alpine Region of the Ozark Mountains of Missouri and Arkansas 2011-07-10T02:00:18.883Z The only practical mode of doing this, as yet devised, is by lining the converter with a silicious mixture. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 3 "Convention" to "Copyright" The best are made of very pure clay or of porcelain earth; whereas such as are made of clay mixed with calcareous or silicious earth are very fusible. Elements of Chemistry, In a New Systematic Order, Containing all the Modern Discoveries Those which I saw appeared to belong to that species of the silicious genus usually called Gneiss, a sort of slaty granite. Travels in China, Containing Descriptions, Observations, and Comparisons, Made and Collected in the Course of a Short Residence at the Imperial Palace of Yuen-Min-Yuen, and on a Subsequent Journey through the Country from Pekin to Canton The paste is silicious, fine-grained, and quite hard. Ancient Pottery of the Mississippi Valley Fourth Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1882-83, Government Printing Office, Washington, 1886, pages 361-436 The composition of the tube of glass, I have judged to be simply a silicious sand and an alkali, probably with a small addition of lime or vegetable ashes. Scenes and Andventures in the Semi-Alpine Region of the Ozark Mountains of Missouri and Arkansas 2011-07-10T02:00:18.883Z When available, a silicious rock containing copper or the precious metals is of course preferred to barren lining. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 3 "Convention" to "Copyright" We are obliged to employ metallic vessels in this process, because fluoric acid dissolves glass and silicious earth, and even renders these bodies volatile, carrying them over with itself in distillation in the gasseous form. Elements of Chemistry, In a New Systematic Order, Containing all the Modern Discoveries Upper Miocene.—Calcareous marl; gypsum, etc.; sulphur embedded in calcareous limestone; silicious limestone; tripoli, containing fossils of fish, insects' eggs, etc. Scientific American Supplement, No. 647, May 26, 1888 The soil of this bottom is an argillaceous or a silicious loam, according as clay or sand happens to predominate in its formation. A New Guide for Emigrants to the West The silicious concretion obtained from the leaves is used as a polish in the form of polish paper. The Medicinal Plants of the Philippines It is only in regions where the rocks are granitic or silicious, where, at least, the surface waters are free or nearly free from lime, that mosses make the bulk of the peat. Peat and its Uses as Fertilizer and Fuel Its contents have been reduced by the constant action to a mixed silicious clay, which in former years consisted of different colors, but is now active only in the white portion of its formation. Shepp's Photographs of the World Lower Miocene.—Rock salt; blue marl, containing petroleum and bitumen; flintstone; ferruginous clay, mixed with aragonite and bituminous schists; ferruginous and silicious sandstone. Scientific American Supplement, No. 647, May 26, 1888 All the geyser water in this district is so charged with silicious earths that it consolidates sufficiently rapidly to form an upright rim around each geyser's vent. A Girl's Ride in Iceland The rocks about Kingston are usually a very compact limestone, of a bluish-gray color, having a slight silicious admixture, increasing as the depth increases, with occasional intrusions of quartz or hornstone. The Conquest of Canada (Vol. 1 of 2) The composition of the asphalt was as follows: 440 lbs. rock asphalt mastic, 3 gallons coal tar, and 5 gallons silicious sand. Concrete Construction Methods and Costs A kind of hopper containing fine silicious sand was connected with a reservoir of compressed air, the pressure being variable at pleasure. Fragments of science, V. 1-2 Both the Cuban and American planters concur in asserting that a large quantity of silicious matters in soils is essential for the growth of good tobacco. Tobacco; Its History, Varieties, Culture, Manufacture and Commerce There it formed perpendicular shore cliffs, nine to twelve metres high, consisting of magnesian slate, limestone more or less mixed with quartz, and silicious slate. The Voyage of the Vega round Asia and Europe, Volume I and Volume II This yellow sulphuret, from being mixed with a large quantity of iron and silicious earth, contains only about 12 or 14 per cent. Chambers's Edinburgh Journal, No. 458 Volume 18, New Series, October 9, 1852 Among the forms which you will find are the silicious skeletons of diatoms, the calcareous skeletons of foraminifera, scales of fish, and, rarely, the whole skeleton of a fish. The Western United States A Geographical Reader But you have practically but one soil to deal with, a true limestone soil of high fertility, which has received considerable accessions from silicious rocks. Prairie Farmer, Vol. 56: No. 3, January 19, 1884. A Weekly Journal for the Farm, Orchard and Fireside Its peculiar properties seem to be most perfectly developed in dry, gravelly, or silicious soils, and under the influence of short and warm seasons. The Field and Garden Vegetables of America Containing Full Descriptions of Nearly Eleven Hundred Species and Varietes; With Directions for Propagation, Culture and Use. Thus, in building parlance, the grains are the rubble of the wall, the currents the quarrymen, masons and laborers, and the silicious infiltration the mortar. The American Architect and Building News, Vol. 27, Jan-Mar, 1890 Why, haven’t you silicious sand, the lime from the coral and shells and soda from the seaweeds of thousands of years. Fire Island Being the Adventures of Uncertain Naturalists in an Unknown Track Of silicious soils there are four varieties, viz.—sandy, gravelly, slaty, and rocky. Thomas Davis, Selections from his Prose and Poetry The hard or silicious rocks which form the immediate region, and the quartzite and crystalline limestone, did not lend themselves, either in the quarry or under the chisel, to such work. Mexico Its Ancient and Modern Civilisation, History, Political Conditions, Topography, Natural Resources, Industries and General Development The earth’s interior was, in Lamarck’s opinion, solid, formed of quartzose and silicious rocks, and its centre of gravity did not coincide with its geographical centre, or what he calls the centre de forme. Lamarck, the Founder of Evolution His Life and Work The foundation upon which rest the alluvial formations has been found to consist of a hard blue silicious clay, closely resembling that met with in the bed of the Mississippi. Continental Monthly , Vol. 5, No. 6, June, 1864 Devoted to Literature and National Policy Upon granite soils, it will be of less value than silicious or aluminous ones. Guano A Treatise of Practical Information for Farmers Other dead vegetation, because of the highly silicious water, always gets petrified unless it is eaten first. Uller Uprising Sponges with very rigid inorganic skeletons may be divided into two classes—calcareous and silicious—according to whether the skeleton is chiefly composed of lime or silica. Scientific American, Volume 40, No. 13, March 29, 1879 A Weekly Journal of Practical Information, Art, Science, Mechanics, Chemistry, and Manufactures Other fossils have undergone such an alteration that not only have they lost their animal portion, but their substance has been changed into a silicious matter. Lamarck, the Founder of Evolution His Life and Work Moreover, the marine deposits are generally made up in large part of silicious sand, a material which is produced in large quantities by the disruption of the rocks along the sea coast. Outlines of the Earth's History A Popular Study in Physiography An aberrant flagellate bearing a single flagellum and a silicious skeleton resembling those of the Radiolaria. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 They chew them up, dehydrate them, and convert their silicious outer bark and carbonaceous interiors into silicones for themselves. Uller Uprising These have usually a silicious matrix and were often used by the Romans and others for making querns for corn-grinding. Hertfordshire The calciferous sand rock, which is a silicious limestone. Saratoga and How to See It The purity of these waters is borrowed from the silicious quality of the soil. History and Comprehensive Description of Loudoun County, Virginia The skeleton consists of two rings of different diameter parallel with one another and connected by silicious bars. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 These silicious bodies belong partly to the lowly vegetable organisms which are called Diatomaceæ, and partly to the minute, and extremely simple, animals, termed Radiolaria. Lay Sermons, Addresses and Reviews It is highly probable that the less silicious, _i.e._ the more basic, rocks, mainly come from considerable depths; the more acid or silica-rich rocks, from higher levels in the crust. The Birth-Time of the World and Other Scientific Essays Near to Babylonia the most common kind was limestone; but about Had-disah on the Euphrates there was also a gritty, silicious rock alternating with iron-stone, and in the Arabian Desert were sandstone and granite. The Seven Great Monarchies Of The Ancient Eastern World, Vol 4. (of 7): Babylon The History, Geography, And Antiquities Of Chaldaea, Assyria, Babylon, Media, Persia, Parthia, And Sassanian or New Persian Empire; With Maps and Illustrations. They indicate some practical knowledge of the cleavage of silicious rocks, but they show no power of producing even such finish as the celts frequently exhibit. The Seven Great Monarchies Of The Ancient Eastern World, Vol 1. (of 7): Chaldaea The History, Geography, And Antiquities Of Chaldaea, Assyria, Babylon, Media, Persia, Parthia, And Sassanian or New Persian Empire; With Maps and Illustrations. The chitin of the shell is covered with silicious particles of diverse size. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 It was built of crude brick mixed with a good deal of straw, and cased with a white silicious limestone. Ancient Egypt As in borax, but leaves a silicious skeleton. A System of Instruction in the Practical Use of the Blowpipe Being A Graduated Course Of Analysis For The Use Of Students And All Those Engaged In The Examination Of Metallic Combinations Among the porous substances used is kieselguhr, a silicious earth which consists chiefly of the skeletons of various species of diatoms. Nitro-Explosives: A Practical Treatise The staple of the soil ought to be silicious, fertile, and deep. The Commercial Products of the Vegetable Kingdom Considered in Their Various Uses to Man and in Their Relation to the Arts and Manufactures; Forming a Practical Treatise & Handbook of Reference for the Colonist, Manufacturer, Merchant, and Consumer, on the Cultivation, Preparation for Shipment, and Commercial Value, &c. of the Various Substances Obtained From Trees and Plants, Entering into the Husbandry of Tropical and Sub-tropical Regions, &c. It is not actually necessary to use rich ores; silicious ores can be used. Scientific American Supplement, No. 829, November 21, 1891 The death of these bodies in the South Arctic Ocean is producing a submarine deposit, consisting entirely of the silicious particles of which the skeletons of these vegetables are composed. COSMOS: A Sketch of the Physical Description of the Universe, Vol. 1 If the temperature be too high, fluosilicic acid is generated, and will form a silicious incrustation upon the cool portion of the tube. A System of Instruction in the Practical Use of the Blowpipe Being A Graduated Course Of Analysis For The Use Of Students And All Those Engaged In The Examination Of Metallic Combinations But there is another chalk known as Barbados earth; it is silicious, and is ultimately composed of minute and beautiful skeletons such as those which, enormously magnified, you now see. Scientific American Supplement, No. 470, January 3, 1885 The Mexicans carved the obdurate jade and emerald with wonderful skill, using, like the Peruvians, nothing but silicious powder and copper instruments alloyed with tin. Lippincott's Magazine of Popular Literature and Science Volume 11, No. 27, June, 1873 In silicious sponges the spicules are composed of silica, and are generally deposited around axial rods in concentric layers. Scientific American Supplement, No. 601, July 9, 1887 In the silicious matter which the water deposits is perhaps the bony system, and in the still finer soil and organic matter the fleshy fibre or cellular tissue. Walden When hydrofluoric acid comes in contact with any silicious substance, hydrofluosilicic acid gas is always formed. A System of Instruction in the Practical Use of the Blowpipe Being A Graduated Course Of Analysis For The Use Of Students And All Those Engaged In The Examination Of Metallic Combinations It is abundant in sulphur, iron, and manganese ores, and sulphuret of mercury: but rare in gypsum, chalk, calcareous and silicious earths. American Hand Book of the Daguerreotype Soon the nature of the soil changed; to the sandy plain succeeded an extent of slimy mud which the Americans call "ooze," composed of equal parts of silicious and calcareous shells. Twenty Thousand Leagues under the Sea Persons who inhabit residences composed of a brittle, transparent, silicious material, should refrain from forcibly casting fragments of granite, etc. Punchinello, Volume 1, No. 08, May 21, 1870 These consisted chiefly of quartz, felspar, and a silicious petrifaction of woody appearance. Journal of an Expedition into the Interior of Tropical Australia Let the earth, or rather its silicious and other decaying rocks, bring forth these batrachian forms. Life: Its True Genesis Below was a stratum of compact red sandstone, changing a little above the river into a very hard silicious limestone. The Exploring Expedition to the Rocky Mountains, Oregon and California To which is Added a Description of the Physical Geography of California, with Recent Notices of the Gold Region from the Latest and Most Authentic Sources The soil was formed of a silicious clay mixed with decayed vegetation. The Mysterious Island It is intersected by numerous broad Wadys, in which the Talh tree grows; the rock is entirely silicious, of the same species as that of the desert which extends from hence to Suez. Travels in Syria and the Holy Land He has obtained strong plants upon a soil with 53 per cent. of lime, and these have withstood the severe winter of 1879-1880, while individuals of the same species grown on silicious ground have failed. Scientific American Supplement, No. 430, March 29, 1884 But the use of a spatula and a small piece of polished stone slab will show that the entire discharge is excrementitious matter, with the single exception of this silicious coating of the seeds. Life: Its True Genesis The surrounding rocks are either volcanic products, or highly altered by volcanic action, consisting of quartz and reddish-colored silicious masses. The Exploring Expedition to the Rocky Mountains, Oregon and California To which is Added a Description of the Physical Geography of California, with Recent Notices of the Gold Region from the Latest and Most Authentic Sources The soil best adapted to its culture should be composed of pure ground, somewhat silicious and dry. Scientific American Supplement, No. 299, September 24, 1881 The glaze is made from the silicious clay and potash extracted from wood ashes. Scientific American Supplement, No. 303, October 22, 1881 Rhododendron intermedium is an intermediate form between the hairy and the rusty species from the Swiss Alps, R. hirsutum and R. ferrugineum, the former growing on chalky, and the other on silicious soils. Species and Varieties, Their Origin by Mutation The base is a coarse granular, silicious sandstone, in which large pebbles of quartz and jaspar are imbedded. The History of Australian Exploration from 1788 to 1888 Mixed among the white substance is a quantity of silicious clay of all sorts and conditions of color. My Native Land The United States: its Wonders, its Beauties, and its People; with Descriptive Notes, Character Sketches, Folk Lore, Traditions, Legends and History, for the Amusement of the Old and the Instruction of the Young These clays perhaps come from the same rocks from the disintegration of which the silicious earth has been formed. The Former Philippines thru Foreign Eyes "Diatoms in a fossilised condition are silicious, and they are to be found in Virginia, in Bermuda, and here." Bunch Grass A Chronicle of Life on a Cattle Ranch Like the Globigerina ooze, then, which it succeeds to the southward in a band apparently of no great width, the materials of this silicious deposit are derived entirely from the surface and intermediate depths. Discourses Biological and Geological Essays The cones are about four inches long, exceedingly hard, and covered with a sort of silicious varnish and gum, rendering them impervious to moisture, evidently with a view to the careful preservation of the seeds. The Mountains of California He had also made many experiments in galvanism, and had found silicious earth in the skin of reeds and grass. The Junior Classics — Volume 7 Stories of Courage and Heroism We followed the sea-shore, which is composed of silicious sand, and covered with a carpet of creeping shore plants in full bloom. The Former Philippines thru Foreign Eyes He was trying to estimate the effect of silicious matter upon the mucous membrane of a cow, when he saw Dan, sombrero in hand, bowing low before him. Bunch Grass A Chronicle of Life on a Cattle Ranch The evidence respecting the corresponding Arctic area is less complete, but it is sufficient to justify the conclusion that an essentially similar silicious cap is being formed around the northern pole. Discourses Biological and Geological Essays The most perfect of the polished pavements and walls lie at an elevation of from 7000 to 9000 feet above the sea, where the rock is compact silicious granite. The Mountains of California It is exceedingly fine and of excellent silicious quality, especially in the vicinity of Sidon and at the foot of Mount Carmel. History of Phoenicia The soil was light and friable, and below lay a bed of silicious tufa; therefore, even without tools, the aperture deepened quickly. In Search of the Castaways; or the Children of Captain Grant The silicious fragments in that confounded earth have lacerated terribly the mucous membranes of these three unfortunate young men. Bunch Grass A Chronicle of Life on a Cattle Ranch These silicious bodies belong partly to the lowly vegetable organisms which are called Diatomaceoe, and partly to the minute, and extremely simple, animals, termed Radiolaria. Discourses Biological and Geological Essays They come nearer in character to the Yellowstone geysers, their waters depositing true geyserite, or silicious concretions. The San Francisco calamity by earthquake and fire These silicious bodies belong partly to the lowly vegetable organisms which are called Diatomaceae, and partly to the minute, and extremely simple, animals, termed Radiolaria. Autobiography and Selected Essays A slight mechanical change would produce a crater of eruption in these slopes, which consisted merely of whitish silicious tufa. In Search of the Castaways; or the Children of Captain Grant But just as a silicious deposit may be metamorphosed into opal or quartzite, and chalk into marble, so known metamorphic agencies may metamorphose clay into schist, clay-slate, slate, gneiss, or even granite. Discourses Biological and Geological Essays For the present we must be content with the fact that, in certain areas of the "intermediate zone," greensand is replacing and representing the primitively calcareo- silicious ooze. Discourses Biological and Geological Essays Here nearly every form of geyser and unintermittent hot spring occurs, with deposits of various kinds, silicious, calcareous, etc. The San Francisco calamity by earthquake and fire By far the most abundant was the little bundle of silicious rods, fastened together loosely at one end, separating from one another at the other end, and the whole bundle loosely twisted into a spindle. Discourses Biological and Geological Essays The silicious particles which constitute this mud, are derived, in part, from the diatomaceous plants and radiolarian animals which throng the surface, and, in part, from the spicula of sponges which live at the bottom. Discourses Biological and Geological Essays But there is no mound, and the rocks of the fissure are just beginning to get a coating of the silicious geyserite deposited from the water, so that it cannot long have been spouting. The San Francisco calamity by earthquake and fire |
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