| 单词 | percolation |
| 例句 | A better indicator may be the online percolation on sites with tools that measure awareness via user interest. Unlike "Fast Color," "Raising Dion" may be an industry underdog tale where the little guy wins 2019-10-12T04:00:00Z The design of the building, too, mimicked the online world of flux, self-expression and the percolation of culture from below, all the ideals of the optimistic early age of Internet culture. Perspective | Born in the age of high hopes, the Newseum dies in the days of fake news 2019-12-19T05:00:00Z These are intelligent songs about love going wrong, glossed with heavenly coos and backing harmonies and given percolation by the band's gentle funk. Solange – review 2013-01-20T00:06:13Z And he asked a group of engineers to design the monstrous “Mud Muse,” a vat of beige sludge — 8,000 pounds of it — that keeps bubbling away to the fed-back vibes of its own percolation. Robert Rauschenberg: It Takes a Village to Raise a Genius 2017-05-18T04:00:00Z Somewhere in between is a critical value, called the percolation threshold, at which the fluid begins to flow all the way across the network. Bizarre Quantum Theory Explains Why Your Coffee Takes So Long to Drip through a Narrow Filter 2023-09-25T04:00:00Z And yet too many of us are obsessed with injustice, seeking its percolation and manifestation at every corner. Why a North Korean toddler’s Bible arrest offers a dire warning to America 2023-05-31T04:00:00Z After 40 years of reflection and percolation, some of the answers to those questions are visible on the other side of town, at the sprawling blockbuster show “Melbourne Now,” which opens today at the N.G.V. Melbourne Art and Design, Past and Present 2023-03-23T04:00:00Z Her debut album, “Yellow River Blue,” bounds between ambient, dub and house music, with propulsive percussion and synthesizers that generate gauzy textures and warm percolations, with a reverberating depth that feels three-dimensional. 4 concerts to catch in the D.C. area over the next several days 2023-02-01T05:00:00Z “This court ordinarily awaits percolation of legal issues in the lower courts before granting review and would benefit from such percolation here.” Supreme Court: N.Y. gun law may be enforced while challenges continue 2023-01-11T05:00:00Z It turns out that the percolation threshold is analogous to the critical temperature. Bizarre Quantum Theory Explains Why Your Coffee Takes So Long to Drip through a Narrow Filter 2023-09-25T04:00:00Z "The flows and percolation of waters through soils remarkably filters the waters, and the problems arise from flows over the surface and especially contamination from feces from cattle and other animals," Trenberth observed. Melting glaciers could spread unseen pathogens around Earth: study 2022-10-20T04:00:00Z Lymph nodes are specialized organs that filter the lymph by percolation through a maze of connective tissue filled with white blood cells. Biology for AP Courses 2022-06-09T00:00:00Z Downward percolation of water from melting taking place at the surface contributes to the process of ice formation. Physical Geology 2015-01-01T00:00:00Z They are connected to one another in a way that would seem to lend itself very well to percolation theory, which is precisely geared toward modeling the connections among discrete nodes. Readers Respond to the April 2021 Issue 2021-08-28T04:00:00Z How did your work open these new doors for mathematicians to solve problems related to percolation theory? Bizarre Quantum Theory Explains Why Your Coffee Takes So Long to Drip through a Narrow Filter 2023-09-25T04:00:00Z “We have a little more time for the consideration of this, and the percolation of these proposals, to have broader consultation and dialogue,” said Steve Ricchetti, a top White House aide. Democrats signal they’re open to concessions on infrastructure 2021-04-30T04:00:00Z Bogs usually occur in areas where there is a clay bottom with poor percolation. Biology for AP Courses 2022-06-09T00:00:00Z Soil development is facilitated by the downward percolation of water. Physical Geology 2015-01-01T00:00:00Z Contamination at the site reached the aquifer through injection wells, unlined percolation ponds, pits where radioactive material from other states was dumped, and accidental spills. Report: Radioactive cleanup at Idaho nuclear site working 2021-03-26T04:00:00Z Research shows that the percolation threshold for a network drops if the network has a broader degree distribution, meaning a wider range in the degrees of the nodes. The Mathematics of How Connections Become Global 2021-03-16T04:00:00Z The scorched areas could alter snow retention due to loss of tree canopy and increased snowmelt along with reduced percolation of water into the ground due to severely burned soils, he said. Water content of California’s early winter snowpack lagging 2020-12-30T05:00:00Z The greens were created from a different sand that allows for ideal percolation. Trinity Forest is presented with Golf Digest's 2018 Green Star environmental award - Golf Digest 2018-04-22T04:00:00Z "Trees are stressing now. They need deeper percolation." The 5 biggest misconceptions about watering your lawn and garden during a drought 2015-10-03T04:00:00Z Queen's is developing a rice cooker based on percolation. Who, What, Why: Is it safer to cook rice in a coffee percolator to avoid arsenic? - BBC News 2015-07-23T04:00:00Z A branch of mathematics called percolation theory offers a surprising answer: just a few people can make all the difference. The Mathematics of How Connections Become Global 2021-03-16T04:00:00Z Testing the rice before and after cooking showed that coffee-pot percolation removed about half the arsenic, and that the lab apparatus removed around 60–70%. Simple cooking methods flush arsenic out of rice 2015-07-21T04:00:00Z With the sound-enhancing Active Sport Exhaust selected, the engine percolation is thrilling. Jaguar revs up excitement with its F-Type R 2015-07-18T04:00:00Z There were percolations of it last summer in disagreements over your successor. Exclusive: Bud Selig: the baseball commissioner's exit interview 2015-01-07T05:00:00Z The design allows for on-site percolation rather than runoff. More California gardeners go native 2014-10-16T04:00:00Z The percolation network of a rock layer consists of little holes in its structure, represented as nodes, along with the channels or cracks that allow fluid to flow between them, represented as edges. The Mathematics of How Connections Become Global 2021-03-16T04:00:00Z Using ab initio computations, we demonstrate that this unexpected behavior is due to percolation of a certain type of active diffusion channels in disordered Li-excess materials. [Report] Unlocking the Potential of Cation-Disordered Oxides for Rechargeable Lithium Batteries 2014-01-30T19:26:03.886Z Furrow irrigation, like that found in the orchards of California, is 64% efficient at getting water into plants for transpiration and growth, as opposed to being lost through evaporation or percolation deep into the soil. Water: The flow of technology 2013-09-25T21:50:42.130Z For one particular ratio of those three numbers, percolation transition always happened. A Slimy Insight Into Treating Cancer 2012-08-23T17:21:00Z The earlier treasury was probably destroyed either by earthquake or by the percolation of water through the terracing. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 10 "David, St" to "Demidov" 2012-02-17T03:00:33.923Z Lattices are good models for percolation in physical systems such as fractured rock, where the holes are in fixed locations and the cracks between them form randomly. The Mathematics of How Connections Become Global 2021-03-16T04:00:00Z In some cases, these tracts compose basins apparently scarcely at all exposed to any local influence in the way of percolation or infiltration of water toward or from neighboring valleys. Man and Nature or, Physical Geography as Modified by Human Action 2011-11-11T03:00:34.027Z The genesis of the last three types of deposit is generally assigned to the simultaneous percolation of solutions of gold and silica, the auriferous solution being formed during the disintegration of the gold-bearing metalliferous veins. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 2 "Gloss" to "Gordon, Charles George" 2011-10-31T02:00:28.703Z Writing in Physical Review Letters, the scientists found that the transition from multiple mold islands to an interconnected network—the percolation transition—always occurred when the nodes and lines fell into one particular, peculiar pattern. A Slimy Insight Into Treating Cancer 2012-08-23T17:21:00Z “There’s a certain percolation that goes on with experts in the field.” Changes to Police Lineup Procedures Cut Eyewitness Mistakes, Study Says 2011-09-19T00:47:50Z The model nonetheless highlights the central role that percolation theory plays in real mesh networks. The Mathematics of How Connections Become Global 2021-03-16T04:00:00Z They melt together brokenly; and sometimes they are fretted with darkness and spotted with caverns, or mottled and zigzagged by rusty percolations of iron. A West Country Pilgrimage 2011-08-05T02:00:48.947Z Liquids find their way through the intestines by a system of percolation, and do not excite peristaltic movements. Psychotherapy 2011-06-19T02:00:20.053Z "The results are very interesting and novel," says Nakagaki, who was not involved in the present work, "and the analysis by means of a standard technique of percolation is clear and beautiful." A Slimy Insight Into Treating Cancer 2012-08-23T17:21:00Z There was no lightbulb-over-my-head moment; just the constant drip-drip percolation of facts and feelings through the semipermeable membrane of my mind. The Choice: Two Red-Eyes, 36 Sleepless Hours and Still a Choice 2011-05-12T16:47:47Z Geologists use a version of percolation theory to study the sizes of clusters in fractured rock, which is relevant to the extraction of oil by fracking and to the occurrence of earthquakes. The Mathematics of How Connections Become Global 2021-03-16T04:00:00Z Fractal geometry is now being used in work with marine organisms, vegetative ecosystems, earthquake data, the behaviour of density-dependent populations, percolation and aggregation in oil research, and in the formation of lightning. Beno?t Mandelbrot obituary 2010-10-17T18:00:00Z Dr. Smirnov, who was born in Russia, provided a firm mathematical foundation to simple models used by physicists to describe magnetism or percolation of water through soil. Four Are Awarded Medal in Mathematics 2010-08-23T22:54:00Z Since the process of connection is mathematically identical to the percolation transition in the slime mold, a mathematical model of the latter should be equally valid for both, he says. A Slimy Insight Into Treating Cancer 2012-08-23T17:21:00Z Nevertheless the secular shrinking goes on, the loss by evaporation and percolation exceeding the amount of water received; whilst, on the average, the rainfall is diminishing. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 7 "Cerargyrite" to "Charing Cross" To model earthquakes, seismologists create percolation networks that match the scale and density of observed cracks, and then they account for stresses by adjusting the probability of cracks connecting up. The Mathematics of How Connections Become Global 2021-03-16T04:00:00Z This wadi, which is some 63 m. long, obtains water by percolation from the Nile. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 6 "Dodwell" to "Drama" These are consolidated by the percolation of rain-water, which dissolves some of the lime from the more porous tracts and deposits it lower down, filling every fissure with stalagmite. Island Life Or the Phenomena and Causes of Insular Faunas and Floras Seepage, percolation and capillary attraction do the rest. The Apple Either by rapid growth of vegetation, or by subsequent percolation of organic solutions, most of the alkalis and the lime have been carried away. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 4 "Cincinnatus" to "Cleruchy" But the existence of a percolation threshold means there is a risk that the network will suddenly lose connectivity as people move around. The Mathematics of How Connections Become Global 2021-03-16T04:00:00Z The old grate used for coal is loosely covered with bricks and cinder, so that a slight percolation of air may take place through them. The Galaxy, Volume 23, No. 2, February, 1877 The percolation of the news of the police failure had reduced the male population to the condition of a joyful desire to celebrate in contraband drink. The Law-Breakers The tramping hardens the soil and shuts out any percolation of water into it. The Apple The fibrous tissue itself is waste material, yielding, by boiling or too long percolations, a coffee colored liquid which is fibrous and twangy in taste, has no aromatic character, and contains undesirable elements. All About Coffee To obtain a theoretical understanding of how the basic shape and structural features of a network impact the spread of a disease, scientists turn to percolation theory. The Mathematics of How Connections Become Global 2021-03-16T04:00:00Z This constant percolation of water is of immense importance to the plant, as it forms the channel through which some of its other constituents are carried to it. Elements of Agricultural Chemistry Water reddened by contact with bricks, water made turbid by percolation through paving-blocks, splashed continuously from hiccuping scuppers. Blow The Man Down A Romance Of The Coast - 1916 The rampart of the redan had been constructed twenty-four feet thick, but the high water beating against it had washed it, and, by percolation, softened it. From Fort Henry to Corinth This use of the word filtering was misleading, as it was many times after in French, English, and American patent nomenclature, where it often meant percolation or something quite different from filtration. All About Coffee The tools offered by the traditional pen-and-paper mathematics of percolation work only in the simplest cases, where the network is artificially ordered and symmetrical. The Mathematics of How Connections Become Global 2021-03-16T04:00:00Z The process of separating a soluble substance from an insoluble by the percolation of water. Vegetable Dyes Being a Book of Recipes and Other Information Useful to the Dyer The proportion which passes off by percolation varies according to the nature of the soil in the locality where it falls. Farm drainage The Principles, Processes, and Effects of Draining Land with Stones, Wood, Plows, and Open Ditches, and Especially with Tiles “The remains that do become embedded, if in sand and gravel, will, when the beds are upraised, generally be dissolved by the percolation of rain-water.” The Foundations of the Origin of Species Two Essays written in 1842 and 1844 True percolation means to drip through fine interstices of china or metal. All About Coffee To understand how this aspect affects the percolation threshold, mathematical epidemiologists such as Meyers generate thousands of sample networks that are essentially random except for one feature: they all have the same degree distribution. The Mathematics of How Connections Become Global 2021-03-16T04:00:00Z Hard and soft soap are for sale in every market for domestic uses, made from lye by percolation or dripping of water through ashes in large earthen vessels or "hoppers." Official Report of the Niger Valley Exploring Party Springs.—These are, as has been suggested, merely the water of rain and snow, impeded in its downward percolation, and collected and poured forth in a perennial flow at a lower level. Farm drainage The Principles, Processes, and Effects of Draining Land with Stones, Wood, Plows, and Open Ditches, and Especially with Tiles Usually, good alfalfa soils have sufficient drainage naturally, the subsoil being sufficiently open to admit of the percolation of water down into the subsoil with sufficient quickness. Clovers and How to Grow Them In 1819, Laurens produced the original of the percolation device in which the boiling water is raised by a tube and sprayed over the ground coffee. All About Coffee “We are not living in a bubble or a fully mixed world. We live in a world with contacts, we follow Twitter accounts, and these are places where percolation and other models enter,” Vespignani says. The Mathematics of How Connections Become Global 2021-03-16T04:00:00Z Finally, on the 27th September, a percolation of blood also set in on the forehead, as if the young girl had been crowned with thorns. The Mysteries of All Nations Rise and Progress of Superstition, Laws Against and Trials of Witches, Ancient and Modern Delusions Together With Strange Customs, Fables, and Tales Of course, there is lower land towards the natural outlet, but usually this is narrow, and quite insufficient to allow of drainage by lateral percolation. Farm drainage The Principles, Processes, and Effects of Draining Land with Stones, Wood, Plows, and Open Ditches, and Especially with Tiles He scarcely alluded to the corruption and peculation prevalent in all high places, diluted in its downward percolation till sutlers and horse-thieves would strive in vain to emulate the fraudulent audacity of their superiors. Border and Bastille Kelly, Kansas City, was granted a United States patent on the Kellum Automatic coffee urn, employing a coffee extractor in which ground coffee is continually agitated before percolation by a vacuum process. All About Coffee This critical position of the dial is known as the percolation threshold. The Mathematics of How Connections Become Global 2021-03-16T04:00:00Z A special process is employed of passing the material twice through a sausage machine, and then mixing the mass with powdered glass before its percolation with the spirit. Herbal Simples Approved for Modern Uses of Cure The water from below, is constantly pressing slowly up through it, of course preventing any downward percolation of the rain-water. Farm drainage The Principles, Processes, and Effects of Draining Land with Stones, Wood, Plows, and Open Ditches, and Especially with Tiles Several times I passed my hand across the rock hoping to find some trace of humidity—of the slightest percolation. A Journey to the Centre of the Earth In the strictest sense of the term, an infusion is also produced by percolation and filtration, when the water is not boiled in contact with the coffee. All About Coffee Such networks are described by a different model, called continuum percolation, because the nodes of the mesh network can be anywhere in a continuous space. The Mathematics of How Connections Become Global 2021-03-16T04:00:00Z They maintain their level by receiving fresh water at the head and by percolation through the beach, while most of them are connected with the sea. To The Gold Coast for Gold, Vol. II A Personal Narrative The light texture of the soil admits of the easy percolation of water through it, and, except where the subsoil contains considerable sand, the soil moisture is well retained. History and Comprehensive Description of Loudoun County, Virginia It is the basis for spirits, tinctures and elixirs; spirits being solutions of volatile substances in alcohol; tinctures, solutions of active principles of plants, generally obtained by maceration and percolation. Mother's Remedies Over One Thousand Tried and Tested Remedies from Mothers of the United States and Canada The apparatus most in use for the percolation of coffee is a tin coffee-pot composed of two parts. All About Coffee There are two ways to increase the connectivity of this continuum percolation network: enable direct connection at a longer range or add more smartphones, increasing the density of users. The Mathematics of How Connections Become Global 2021-03-16T04:00:00Z By the constant addition of fresh water from the surface, by percolation or other usual ways of sinking, the necessary conditions for the generation of steam are maintained with surprising regularity. Cave Regions of the Ozarks and Black Hills The loamy subsoil allows a ready but not too rapid percolation of surplus soil moisture, and never gets soggy or in a cold, sour condition. History and Comprehensive Description of Loudoun County, Virginia No other means of agitation or percolation is so efficacious or economical.' Chambers's Edinburgh Journal, No. 426 Volume 17, New Series, February 28, 1852 He refers, though not by name, to De Belloy's percolation method and says, "Its usefulness is now universally acknowledged." All About Coffee The fundamental insight of percolation theory, which dates back to the 1950s, is that as the number of links in a network gradually increases, a global cluster of connected nodes will suddenly emerge. The Mathematics of How Connections Become Global 2021-03-16T04:00:00Z Loss of Soil Water By surface wash By percolation and leaching By evaporation By transpiration How to check these losses 53 VII. The First Book of Farming The existence of the fault helped him a good deal, as the percolation of water at this point had oxidized the stone to rottenness. The Wings of the Morning The peculiar smell and flavour, it seems, are preserved notwithstanding this percolation, and are considered amply remunerative of the pains and importunity used to obtain it. A General History and Collection of Voyages and Travels — Volume 13 In the home, it is prepared by boiling, infusion or steeping, percolation, and filtration; in the hotels and restaurants, by infusion, percolation, and filtration. All About Coffee They abstracted the study of percolation in chemistry, which describes a fluid filtering through a material, such as oil seeping through porous rock or water filtering through ground coffee. The Mathematics of How Connections Become Global 2021-03-16T04:00:00Z We noticed that water poured on the sand ran through it very quickly and was apt to be lost by leaching or percolation. The First Book of Farming If the cave be entirely filled, the included deposits generally get more or less completely cemented together by the percolation through them of water holding carbonate of lime in solution. The Ancient Life History of the Earth A Comprehensive Outline of the Principles and Leading Facts of Palæontological Science Then I carried him and my clothes from the bungalow, interred them, heaped back the soil and left the eternal percolations from above to do the rest. The Red Redmaynes The leachers do not differ materially from the ordinary restaurant percolators, a battery usually including from three to seven units, each charge of water going through all the percolations. All About Coffee Modified versions of the percolation process allow cracks to heal and refracture to simulate aftershocks or long-term change. The Mathematics of How Connections Become Global 2021-03-16T04:00:00Z Some fields are underlaid by a close, compact subsoil which so checks percolation that the surface soil is too wet for tillage operations the greater part of the year. The First Book of Farming For is it not obvious that if you put down at once a supply of nitrogen and lime to last for three years, you increase the risk of loss from wash and downward percolation? Gold, Sport, and Coffee Planting in Mysore Conditions analogous to all these particularised, present themselves at Jaffna, and seem to indicate that the extent to which fresh water is found there, is directly connected with percolation from the sea. Ceylon; an Account of the Island Physical, Historical, and Topographical with Notices of Its Natural History, Antiquities and Productions, Volume 1 Kelly, of Kansas City, was granted a United States patent on an urn coffee machine employing a coffee extractor in which the ground coffee was continually agitated before percolation by a vacuum process. All About Coffee If the likelihood of their joining increases, the system will eventually hit the percolation threshold, and one giant, connected polymer will emerge. The Mathematics of How Connections Become Global 2021-03-16T04:00:00Z In this the elephants contrive to sink wells for their own use by scooping out the sand to the depth of four or five feet, and leaving a hollow for the percolation of the spring. Sketches of the Natural History of Ceylon Now, the percolation of water may increase the porousness of that body which it pervades, but never can thus change it from a porous to a perfect solid body. Theory of the Earth, Volume 1 (of 4) The soil is a light loam, easily worked, suited to rapid percolation, admitting of labor immediately after heavy rain, and not liable to suffer by drought. The Atlantic Monthly, Volume 11, No. 66, April, 1863 Turning the pot upside down the percolation takes place very slowly and no aroma is lost. All About Coffee And despite decades of effort, the exact percolation thresholds are known only for a few exceedingly simple networks. The Mathematics of How Connections Become Global 2021-03-16T04:00:00Z The whole then became consolidated by the percolation of calcareous matter; and the cylindrical cavities left by the decaying of the wood, were thus also filled up with a hard pseudo-stalactical stone. The Voyage of the Beagle The percolations from above are heated to steam by stones rich in 'grough brimstone.' To the Gold Coast for Gold A Personal Narrative in Two Volumes.—Volume I I imagine it is caused by some inequality in the grains of sand; probably a few atoms larger than the others come together at the neck, and so stop the percolation. The Strong Arm After that, the best practise became divided between simple percolation and filtration, which have continued to the present time. All About Coffee These mineral impurities are derived by contact of the water with the earth's surface, and by percolation through its soil and rocks. Scientific American Supplement, No. 363, December 16, 1882 It is desirable to allow the material to soak for some hours before commencing the percolation, which should occupy not less than three hours, so as to extract the maximum of tannin. Synthetic Tannins The latter appears at present in the shape of a fish-pond, measuring sixty by forty metres; sunk below sea-level, fed by percolation, and exceedingly salt. The Land of Midian — Volume 1 The argillaceous earth at the bottom of the pans was made hard to prevent the escape of the water by percolation. Voyages of Samuel De Champlain — Volume 01 Percolation devices are subdivided into the simple drip pots and the continuous percolation machines, as represented by numerous complicated and high-priced contrivances on the market. All About Coffee It is clearly a torrential accumulation, and is supposed to have been formed while the Chalk was frozen, thus preventing percolation of water and causing the surface water to run off as strong streams. The Antiquity of Man It has been ascribed, and probably with reason, to the percolation through the rocks of rain-water charged with a little acid from the decomposing vegetation. The Naturalist in Nicaragua But water is found beneath the sands at points far above and beyond the reach of the inundations, and can be accounted for only by subterranean percolation from the Nile. The Earth as Modified by Human Action The percolation of rain-water has consolidated parts of these beds into a solid rock, and has formed masses of dark brown, stalagmitic limestone. Volcanic Islands Gradually, however, true coffee lovers are realizing that the best results are to be obtained through simple percolation or simple filtration. All About Coffee From the facts now given we may conclude that castings ejected on our Chalk Downs suffer some loss by the percolation of their finer matter into the chalk. The formation of vegetable mould through the action of worms, with observations on their habits The remains which do become embedded, if in sand or gravel, will, when the beds are upraised, generally be dissolved by the percolation of rain water charged with carbonic acid. The Origin of Species by means of Natural Selection, 6th Edition Castelli suspected that the excess was received by underground caverns, and slowly conducted by percolation to the bed of the Tiber. The Earth as Modified by Human Action The remains which do become embedded, if in sand or gravel, will when the beds are upraised generally be dissolved by the percolation of rain-water. On the Origin of Species By Means of Natural Selection, or, the Preservation of Favoured Races in the Struggle for Life The methods employed for preparing the coffee drink may be classified under the general headings of boiling, steeping, percolation, and filtration. All About Coffee There is, moreover, another cause of loss, namely, in the percolation of the finer particles of earth into the fissures in the chalk and into the chalk itself. The formation of vegetable mould through the action of worms, with observations on their habits Kelly, Kansas City, Mo., is granted a United States patent on the Kellum Thermo Automatic coffee urn, employing a coffee extractor in which the ground coffee is continually agitated before percolation by a vacuum process. All About Coffee In some cases, these tracts compose basins apparently scarcely at all exposed to any local influence in the way of percolation or infiltration of water towards or from neighboring valleys. The Earth as Modified by Human Action In the latter case, percolation begins at once. All About Coffee True percolation is the simple process known by the trade as filtration; but in this classification, the term indicates the style of extraction exemplified by the pumping percolator. All About Coffee That such percolation occurs can hardly be doubted. The formation of vegetable mould through the action of worms, with observations on their habits Besides the loss caused by percolation, some fine earth is certainly washed down the sloping grass-covered surfaces of our Downs. The formation of vegetable mould through the action of worms, with observations on their habits |
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