The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, 1권Hurst, 1890 - 501페이지 |
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179 페이지
... organs , and as we know nothing about the habits and structure of the progenitors of the existing electric fishes , it would be extremely bold to maintain that no serviceable transitions are possible by which these organs might have ...
... organs , and as we know nothing about the habits and structure of the progenitors of the existing electric fishes , it would be extremely bold to maintain that no serviceable transitions are possible by which these organs might have ...
469 페이지
... organ or lung . Many similar instances could be given . Useful organs , however little they may be developed , unless we have reason to suppose that they were formerly more highly developed , ought not to be considered as rudimentary ...
... organ or lung . Many similar instances could be given . Useful organs , however little they may be developed , unless we have reason to suppose that they were formerly more highly developed , ought not to be considered as rudimentary ...
472 페이지
... organs in our domestic productions , as the stump of a tail in tailless breeds , the vestige of an ear in earless breeds of sheep - the reappearance of minute dang- ling horns in hornless breeds of cattle , more especially , according ...
... organs in our domestic productions , as the stump of a tail in tailless breeds , the vestige of an ear in earless breeds of sheep - the reappearance of minute dang- ling horns in hornless breeds of cattle , more especially , according ...
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adapted admit affinities allied species America ancient appear Asa Gray beak become bees believe belonging birds breeds cause cells characters climate closely allied color continued crossed crustaceans degree developed difficulty distinct species domestic doubt effects eggs embryo existing extinct extremely facts favorable females fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate intervals kind lamellæ larvæ less living male mammals manner marsupials migration modified descendants natural selection naturalists nearly nest oceanic islands offspring organs parent peculiar perfect pigeons pistil pollen present principle probably produced quadrupeds ranked remarked resemblance rudimentary seeds sexual selection Silurian slight South America stamens sterility structure successive suppose tend theory tion trees variability variations varieties vary whole widely different wings young