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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82개의 결과 중 1 - 5개
4 페이지
... less do we know of the mutual relations of the innumerable inhabitants of the world during the many past geological epochs in its history . Although much remains obscure , and will long remain obscure , I can entertain no doubt , after ...
... less do we know of the mutual relations of the innumerable inhabitants of the world during the many past geological epochs in its history . Although much remains obscure , and will long remain obscure , I can entertain no doubt , after ...
8 페이지
... less and the bones of the leg more , in proportion to the whole skeleton , than do the same bones in the wild duck ; and this change may be safely attributed to the domestic duck flying much less , and walking more , than its wild ...
... less and the bones of the leg more , in proportion to the whole skeleton , than do the same bones in the wild duck ; and this change may be safely attributed to the domestic duck flying much less , and walking more , than its wild ...
11 페이지
... less uniformity of character than in true species . Domestic races often have a somewhat monstrous character ; by which I mean , that , although differing from each other , and from other species of the same genus , in several trifling ...
... less uniformity of character than in true species . Domestic races often have a somewhat monstrous character ; by which I mean , that , although differing from each other , and from other species of the same genus , in several trifling ...
18 페이지
... less and less , as in each succeeding generation there will be less of the foreign blood ; but when there has been no cross , and there is a tendency in the breed to revert to a character which was lost during some former generation ...
... less and less , as in each succeeding generation there will be less of the foreign blood ; but when there has been no cross , and there is a tendency in the breed to revert to a character which was lost during some former generation ...
20 페이지
... less of the laws of inheritance than does the breeder , and knowing no more than he does of the inter- mediate links in the long lines of descent , yet admit that many of our domestic races are descended from the same parents - may they ...
... less of the laws of inheritance than does the breeder , and knowing no more than he does of the inter- mediate links in the long lines of descent , yet admit that many of our domestic races are descended from the same parents - may they ...
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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