The Physical Basis of SocietyD. Appleton and Company, 1916 - 406 من الصفحات |
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الصفحة 66
... crossing the Amur where it is narrowest in order to make the lowlands . " 11 " For several hundred yards from the shore the air is filled with gulls and terns , as with snowflakes on a winter day . Thousands of plover and sand coursers ...
... crossing the Amur where it is narrowest in order to make the lowlands . " 11 " For several hundred yards from the shore the air is filled with gulls and terns , as with snowflakes on a winter day . Thousands of plover and sand coursers ...
الصفحة 114
... crossing he has elimi- nated weaknesses or combined good traits . He has thus developed the old " love apple , " which was little more than a seedy core with an attractive skin , into the luscious tomato , now one of the most important ...
... crossing he has elimi- nated weaknesses or combined good traits . He has thus developed the old " love apple , " which was little more than a seedy core with an attractive skin , into the luscious tomato , now one of the most important ...
الصفحة 118
... crossing , the canna in addition to having beautiful leaves has developed enormous flower heads . The improvements thus secured show in size , color , length of flowering period and manner of growth 118 THE PHYSICAL BASIS OF SOCIETY.
... crossing , the canna in addition to having beautiful leaves has developed enormous flower heads . The improvements thus secured show in size , color , length of flowering period and manner of growth 118 THE PHYSICAL BASIS OF SOCIETY.
الصفحة 124
... crossing ani- mals , and there is every reason to anticipate greater de- velopment in the future . We have long valued the mule , the hybrid resulting from mating the horse and ass . Mules are , however , infertile . It may be that by ...
... crossing ani- mals , and there is every reason to anticipate greater de- velopment in the future . We have long valued the mule , the hybrid resulting from mating the horse and ass . Mules are , however , infertile . It may be that by ...
الصفحة 164
... crossing of species . " All the species of one genus constituted at first one species ; they were subse- quently modified by hybrid generation ; that is , by inter- crossing with other species . " 22 In the last edition of his " Systema ...
... crossing of species . " All the species of one genus constituted at first one species ; they were subse- quently modified by hybrid generation ; that is , by inter- crossing with other species . " 22 In the last edition of his " Systema ...
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عبارات ومصطلحات مألوفة
Africa America appeared Australoid average bacteria basis become believe biological birds birth-rate black bass blood body born brain breeding carbon carbon dioxid cause cent century cephalic index changes characters child chromosomes civilization color considered crossing Darwin death death-rate discovered discoveries disease earth eggs environment Europe European evidence evolution exist eyes fact feeble-minded female forms germ cells given groups hair head HEMOPHILIA hence heredity human Huntington's chorea Ibid Inasmuch inches increase individuals inheritance insane insects Kallikak Family known large numbers less living long-headed male man's mated Mendelian ment mental Mongols natural selection nature Negrito Negro normal organisms ovum parents physical plants and animals possible produced race relatively seems skin social society soil species spermatozoon square mile temperature thought tion traits woman 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.