The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for Life: Reprinted from the Sixth London Edition, with All Additions and CorrectionsA. L. Burt Company, 1890 - 538페이지 |
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79 페이지
... structure of the adult . So , con- versely , modifications in the adult may affect the structure of the larva ; but in all cases natural selection will insure that they shall not be injurious : for if they were so , the species would ...
... structure of the adult . So , con- versely , modifications in the adult may affect the structure of the larva ; but in all cases natural selection will insure that they shall not be injurious : for if they were so , the species would ...
167 페이지
... structure in a fossil condition will always be less , from their having existed in lesser numbers , than in the case of species with fully developed structures . { I will now give two or three instances , both of diversified and of ...
... structure in a fossil condition will always be less , from their having existed in lesser numbers , than in the case of species with fully developed structures . { I will now give two or three instances , both of diversified and of ...
466 페이지
... structure of the embryo is even more important for classification than that of the adult . In two or more groups of animals , however much they may differ from each other in structure and habits in their adult condition , if they pass ...
... structure of the embryo is even more important for classification than that of the adult . In two or more groups of animals , however much they may differ from each other in structure and habits in their adult condition , if they pass ...
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adapted admit affinities ALEXANDRE DUMAS allied species America ancient appear 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 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 paleozoic parent peculiar perfect pigeons pistil pollen present principle probably produced quadrupeds ranked remarked resemblance rudimentary seeds Silurian SIR WALTER SCOTT slight South America stamens sterility structure successive suppose tend theory tion trees variability variations varieties vary whole widely different wings young