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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... tion paid to their breeding ; for recently in certain parts of Spain and of the United States this animal has been sur- prisingly modified and improved by careful selection ; in peacocks , from not being very easily reared and a large ...
... tion paid to their breeding ; for recently in certain parts of Spain and of the United States this animal has been sur- prisingly modified and improved by careful selection ; in peacocks , from not being very easily reared and a large ...
89 페이지
... tion of the deepest valleys or the formation of long lines of inland cliffs . Natural selection acts only by the preserva- tion and accumulation of small inherited modifications , each profitable to the preserved being ; and as modern ...
... tion of the deepest valleys or the formation of long lines of inland cliffs . Natural selection acts only by the preserva- tion and accumulation of small inherited modifications , each profitable to the preserved being ; and as modern ...
118 페이지
... tion , or the survival of the fittest , does not necessarily in- clude progressive development - it only takes advantage of such variations as arise and are beneficial to each creature under its complex relations of life . And it may be ...
... tion , or the survival of the fittest , does not necessarily in- clude progressive development - it only takes advantage of such variations as arise and are beneficial to each creature under its complex relations of life . And it may be ...
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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