The Physical Basis of SocietyD. Appleton and Company, 1916 - 406 من الصفحات |
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الصفحة 54
Carl Kelsey. sense then the bacteria in the soil may compete with the plants for food . It is evident that these bacteria are performing services of the utmost importance and that the life of the higher forms would be impossible without ...
Carl Kelsey. sense then the bacteria in the soil may compete with the plants for food . It is evident that these bacteria are performing services of the utmost importance and that the life of the higher forms would be impossible without ...
الصفحة 55
... bacteria and the average number per c.c. of ripened cream is about 500,000,000 . The change to butter and cheese is due to bacteria . We use the yeast plant in the making of bread . Hay is in part the result of bacterial action as is ...
... bacteria and the average number per c.c. of ripened cream is about 500,000,000 . The change to butter and cheese is due to bacteria . We use the yeast plant in the making of bread . Hay is in part the result of bacterial action as is ...
الصفحة 56
... bacteria are in large degree ex- cluded . It is impossible to avoid introducing into the digestive tract many bacteria which would prove undesir- able permanent tenants , and these are successfully dis- couraged from gaining a foothold ...
... bacteria are in large degree ex- cluded . It is impossible to avoid introducing into the digestive tract many bacteria which would prove undesir- able permanent tenants , and these are successfully dis- couraged from gaining a foothold ...
الصفحة 64
... bacteria , of which the smallest are the cocci , some 1 / 150,000 of an inch in diameter . The rodlike forms ... bacteria . Some of these are never found in man but are common among animals as , for instance , the cholera of ...
... bacteria , of which the smallest are the cocci , some 1 / 150,000 of an inch in diameter . The rodlike forms ... bacteria . Some of these are never found in man but are common among animals as , for instance , the cholera of ...
الصفحة 89
... Conservation in Theory and Prac- tice . 1914 . Mutual Aid . 1902 . Bacteria in Relation to Country Life . 1908 . 32 Bulletin , United States Department of Agriculture , No. 187 . 1 MERRIAM , C. H. PAMMEL , J. H. SHELFORD MUTUAL AID 95.
... Conservation in Theory and Prac- tice . 1914 . Mutual Aid . 1902 . Bacteria in Relation to Country Life . 1908 . 32 Bulletin , United States Department of Agriculture , No. 187 . 1 MERRIAM , C. H. PAMMEL , J. H. SHELFORD MUTUAL AID 95.
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مقاطع مشهورة
الصفحة 155 - Some drill and bore The solid earth, and from the strata there Extract a register, by which we learn, That he who made it, and revealed its date To Moses, was mistaken in its age.
الصفحة 139 - I happened to read for amusement ' Malthus on Population,' and being well prepared to appreciate the struggle for existence which everywhere goes on from long-continued observation of the habits of animals and plants, it at once struck me that under these circumstances favourable variations would tend to be preserved, and unfavourable ones to be destroyed. The result of this would be the formation of new species. Here then I had at last got a theory by which to work...
الصفحة 58 - Near villages and small towns I have found the nests of humble-bees more numerous than elsewhere, which I attribute to the number of cats that destroy the mice.
الصفحة 139 - In October 1838, that is, fifteen months after I had begun my systematic enquiry, I happened to read for amusement Malthus on Population, and being well prepared to appreciate the struggle for existence which everywhere goes on from long-continued observation of the habits of animals and plants, it at once struck me that under these circumstances favourable variations would...
الصفحة 54 - It may be doubted whether there are many other animals which have played so important a part in the history of the world, as have these lowly organized creatures.
الصفحة 186 - The two parents between them contribute on the average onehalf of each inherited faculty, each of them contributing onequarter of it. The four grandparents contribute between them one-quarter, or each of them one-sixteenth ; and so on, the sum of the series i + J + i + TV + , being equal to 1, as it should be.
الصفحة 126 - This fool wishes to reverse the entire science of astronomy; but sacred Scripture tells us that Joshua commanded the sun to stand still, and not the earth.
الصفحة 58 - I am tempted to give one more instance showing how plants and animals, remote in the scale of nature, are bound together by a web of complex relations.
الصفحة 159 - I can conceive in biology would be the discovery of the instability which leads to the continual division of the cell. When I look at a dividing cell I feel as an astronomer might do if he beheld the formation of a double star: that an original act of creation is taking place before me.
الصفحة 58 - I have also found that the visits of bees are necessary for the fertilization of some kinds of clover; for instance, 20 heads of Dutch clover (Trifolium repens) yielded 2,290 seeds, but 20 other heads protected from bees produced not one.