The Physical Basis of SocietyD. Appleton and Company, 1916 - 406 من الصفحات |
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الصفحة 47
... destroyed , frequently build late in the season in trees . Ducks and geese that are hunted become extremely wary , but will quickly discover and frequent in large numbers a lake where shooting is pro- hibited . In parts of Africa ...
... destroyed , frequently build late in the season in trees . Ducks and geese that are hunted become extremely wary , but will quickly discover and frequent in large numbers a lake where shooting is pro- hibited . In parts of Africa ...
الصفحة 54
... destroying organic compounds . Some of them will live in ice water but the great mass develop at a temperature of 70 ° . The non- spore - bearing bacteria will perish in water at a tempera- ture of 140 ° to 150 ° but the spore - bearing ...
... destroying organic compounds . Some of them will live in ice water but the great mass develop at a temperature of 70 ° . The non- spore - bearing bacteria will perish in water at a tempera- ture of 140 ° to 150 ° but the spore - bearing ...
الصفحة 56
... destroyed or injured " wild " types may be introduced and this Met- chinikoff , one of the most eminent biologists , believed to be a common cause of suffering and premature death . idea is not universally accepted , and many still ...
... destroyed or injured " wild " types may be introduced and this Met- chinikoff , one of the most eminent biologists , believed to be a common cause of suffering and premature death . idea is not universally accepted , and many still ...
الصفحة 60
... destroy their combs and nests ; and Colonel Newman , who has long attended to the habits of humble bees , believes that more than two - thirds of them are thus destroyed all over England . ' Now the • • • number of mice is largely ...
... destroy their combs and nests ; and Colonel Newman , who has long attended to the habits of humble bees , believes that more than two - thirds of them are thus destroyed all over England . ' Now the • • • number of mice is largely ...
الصفحة 61
... destroy the mice . ' Thus we 6 may say with Darwin that next year's crop of purple clover is influenced by the number of humble bees in the district , which varies with the number of field mice , that is to say , with the number of cats ...
... destroy the mice . ' Thus we 6 may say with Darwin that next year's crop of purple clover is influenced by the number of humble bees in the district , which varies with the number of field mice , that is to say , with the number of cats ...
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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.