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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50개의 결과 중 6 - 10개
5 페이지
... climates and treat- ment , we are driven to conclude that this great variability is due to our domestic productions having been raised under conditions of life not so uniform as , and somewhat different from , those to which the parent ...
... climates and treat- ment , we are driven to conclude that this great variability is due to our domestic productions having been raised under conditions of life not so uniform as , and somewhat different from , those to which the parent ...
6 페이지
... climate , etc. Each of the endless variations which we see in the plumage of our fowls must have had some efficient cause ; and if the same cause were to act uniformly during a long series of generations on many individuals , all ...
... climate , etc. Each of the endless variations which we see in the plumage of our fowls must have had some efficient cause ; and if the same cause were to act uniformly during a long series of generations on many individuals , all ...
8 페이지
... climate to another . With animals the increased use or disuse of parts has had a more marked influence ; thus I find in the domestic duck that the bones of the wing weigh less and the bones of the leg more , in proportion to the whole ...
... climate to another . With animals the increased use or disuse of parts has had a more marked influence ; thus I find in the domestic duck that the bones of the wing weigh less and the bones of the leg more , in proportion to the whole ...
12 페이지
... climates . I do not dispute that these capacities have added largely to the value of most of our domesticated productions ; but how could a savage possibly know , when he first tamed an animal , whether it would vary in succeeding ...
... climates . I do not dispute that these capacities have added largely to the value of most of our domesticated productions ; but how could a savage possibly know , when he first tamed an animal , whether it would vary in succeeding ...
44 페이지
... climate - Protection from the number of individuals - Complex relations of all animals and plants throughout nature - Struggle for life most severe between individuals and varieties of the same species : often severe between species of ...
... climate - Protection from the number of individuals - Complex relations of all animals and plants throughout nature - Struggle for life most severe between individuals and varieties of the same species : often severe between species of ...
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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