The Physical Basis of SocietyD. Appleton and Company, 1916 - 406 من الصفحات |
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الصفحة 28
... oxygen , carbonic acid , etc. The ova of different and yet very closely related forms can endure a long period of drought , or even require it to enable them to develop . Hence , every change , as for instance , in the composition of ...
... oxygen , carbonic acid , etc. The ova of different and yet very closely related forms can endure a long period of drought , or even require it to enable them to develop . Hence , every change , as for instance , in the composition of ...
الصفحة 35
... oxygen and gives off more carbon dioxid . 4. Physiological Effects . - In spite of the considerable overlapping with the purely physical effects it seems wise to consider certain types of influences under this caption . Every one is ...
... oxygen and gives off more carbon dioxid . 4. Physiological Effects . - In spite of the considerable overlapping with the purely physical effects it seems wise to consider certain types of influences under this caption . Every one is ...
الصفحة 47
... oxygen reaches them , but so little is required that immer- sion of an hour in carbon dioxid will not kill them . They must be fat when they begin the long sleep and must waken gradually . It is thought that if their temperature falls ...
... oxygen reaches them , but so little is required that immer- sion of an hour in carbon dioxid will not kill them . They must be fat when they begin the long sleep and must waken gradually . It is thought that if their temperature falls ...
الصفحة 52
... oxygen . Plants get the nitrogen and hydrogen largely from the soil , the carbon and oxygen from the air . Now there is very little nitrogen in the rocks , whereas it forms 80 per cent of the air . How is it , then , that cultivated ...
... oxygen . Plants get the nitrogen and hydrogen largely from the soil , the carbon and oxygen from the air . Now there is very little nitrogen in the rocks , whereas it forms 80 per cent of the air . How is it , then , that cultivated ...
الصفحة 58
... oxygen even under the water . So many and so varied are the interrelations between the highest and the lowest forms of life that it is im- possible to exaggerate them and almost impossible for one not a close student of zoology to ...
... oxygen even under the water . So many and so varied are the interrelations between the highest and the lowest forms of life that it is im- possible to exaggerate them and almost impossible for one not a close student of zoology to ...
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agriculture America aniline appeared Asia average bacteria basis bees believe birds black bass body breeding carbon carbon dioxid carbonic acid cause cent century changes characters chromosomes civilization climate coal color combined considered crops Darwin death destroyed discovered discoveries disease early earth eggs elements environment Europe European evidence evolution exist fact favorable feeble-minded female fish forms germ cells groups heat hence heredity human Ibid idea Inasmuch inches increase individuals influence inheritance insects iron Kallikak Family known Lamarck land large numbers larvæ later less light Linnæus living lower Luther reigned male man's mated natural selection nature Negro normal organisms ovum oxygen parents physical plants and animals possible produced race realize seeds smallpox social soil species square mile substances temperature thought tion tropics women yellow yellow fever
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.