The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeJohn Murray, Albemarle Street., 1891 - 432페이지 |
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83개의 결과 중 6 - 10개
10 페이지
... parent . I believe this rule to be of the highest importance in explaining the laws of embryology . These remarks are of course confined to the first appearance of the peculiarity , and not to the primary cause which may have acted on ...
... parent . I believe this rule to be of the highest importance in explaining the laws of embryology . These remarks are of course confined to the first appearance of the peculiarity , and not to the primary cause which may have acted on ...
12 페이지
... parent species . This point , if it could be cleared up , would be interesting ; if , for instance , it could be shown that the greyhound , bloodhound , terrier , spaniel , and bull - dog , which we all know propagate their kind truly ...
... parent species . This point , if it could be cleared up , would be interesting ; if , for instance , it could be shown that the greyhound , bloodhound , terrier , spaniel , and bull - dog , which we all know propagate their kind truly ...
16 페이지
... parent - stocks possessed the charac- teristic enormous crop ? The supposed aboriginal stocks must all have been rock - pigeons , that is , they did not breed or willingly perch on trees . But besides C. livia , with its geographical ...
... parent - stocks possessed the charac- teristic enormous crop ? The supposed aboriginal stocks must all have been rock - pigeons , that is , they did not breed or willingly perch on trees . But besides C. livia , with its geographical ...
20 페이지
... parent , as any naturalist could in coming to a similar conclusion in regard to the many species of finches , or other groups of birds , in nature . One circumstance has struck me much ; namely , that nearly all the breeders of the ...
... parent , as any naturalist could in coming to a similar conclusion in regard to the many species of finches , or other groups of birds , in nature . One circumstance has struck me much ; namely , that nearly all the breeders of the ...
24 페이지
... parent Arabs , so that the latter , by the regulations for the Goodwood Races , are favoured in the weights which they carry . Lord Spencer and others have shown how the cattle of England have increased in weight and in early maturity ...
... parent Arabs , so that the latter , by the regulations for the Goodwood Races , are favoured in the weights which they carry . Lord Spencer and others have shown how the cattle of England have increased in weight and in early maturity ...
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accumulated adapted admit affinities allied species America analogous ancient appear beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species domestic animals doubt effects eggs embryo existing extinct extremely facts favourable female fertilised fertility flowers formation formerly forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number habits Hence hybrids important increase individuals inhabitants inherited insects instance instincts intercrossing intermediate kind lamellæ larvæ less living male mammals manner Marsupials migration modified descendants natural selection naturalists nearly nest occasionally occur oceanic islands offspring organisation organs parent peculiar perfect pigeon pistil pollen present preserved principle probably produced quadrupeds ranked reciprocal crosses remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive supposed tend theory tion variability variations varieties vary whilst whole wings young