The Origin of Species by Means of Natural Selection Or, The Preservation of Favored Races in the Struggle for LifeD. Appleton and Company, 1882 - 458페이지 |
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v 페이지
... animals and plants Nature of the checks to increase . Competition universal-- Effects of climate - Protection from the number of individuals - Complex relations of all animals and plants throughout nature — Struggle for life most severe ...
... animals and plants Nature of the checks to increase . Competition universal-- Effects of climate - Protection from the number of individuals - Complex relations of all animals and plants throughout nature — Struggle for life most severe ...
xv 페이지
... animals tend to vary in some degree , and , secondly , that agriculturists improve their domesticated animals by selection ; and then , he adds , but what is done in this latter case " by art , seems to be done with equal efficacy ...
... animals tend to vary in some degree , and , secondly , that agriculturists improve their domesticated animals by selection ; and then , he adds , but what is done in this latter case " by art , seems to be done with equal efficacy ...
5 페이지
... animals , one of the first points which strikes us is , that they generally differ more from each other than do the individuals of any one species or variety in a state of nature . And if we reflect on the vast diversity of the plants ...
... animals , one of the first points which strikes us is , that they generally differ more from each other than do the individuals of any one species or variety in a state of nature . And if we reflect on the vast diversity of the plants ...
7 페이지
... animals when reared under new or unnatural conditions . Many facts clearly show how eminently susceptible the reproduc- tive system is to very slight changes in the surrounding conditions . Nothing is more easy than to tame an animal ...
... animals when reared under new or unnatural conditions . Many facts clearly show how eminently susceptible the reproduc- tive system is to very slight changes in the surrounding conditions . Nothing is more easy than to tame an animal ...
8 페이지
... animals the increased use or disuse of parts has had a more marked influence ; thus I find in the domestic duck that ... animals can be named which has not in some country drooping ears ; and the view which has been suggested that the ...
... animals the increased use or disuse of parts has had a more marked influence ; thus I find in the domestic duck that ... animals can be named which has not in some country drooping ears ; and the view which has been suggested that the ...
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adapted admit affinities allied species America analogous ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied colour continued crossed crustaceans degree developed difficulty distinct species doubt effects eggs embryo existing extinct extremely facts favourable fertilised fertility flowers formations formerly forms fossil Fritz Müller genera genus geological Glacial period gradations greater number groups of species habits Hence hybrids important 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 reproductive resemblance rudimentary seeds sexual selection slight South America stamens sterility structure struggle successive supposed theory tion variability variations varieties vary whilst whole wings young