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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144 페이지
... hand , and the tendency to rever- sion and variability on the other hand , will in the course of time cease ; and that the most abnormally developed organs may be made constant , I see no reason to doubt . Hence , when an organ ...
... hand , and the tendency to rever- sion and variability on the other hand , will in the course of time cease ; and that the most abnormally developed organs may be made constant , I see no reason to doubt . Hence , when an organ ...
249 페이지
... hand , habit alone in some cases has sufficed ; hardly any animal is more difficult to tame than the young of the wild rabbit ; scarcely any animal is tamer than the young of the tame rabbit ; but I can hardly suppose that domestic ...
... hand , habit alone in some cases has sufficed ; hardly any animal is more difficult to tame than the young of the wild rabbit ; scarcely any animal is tamer than the young of the tame rabbit ; but I can hardly suppose that domestic ...
429 페이지
... hand have , on this same principle , much in common , and form a subfamily , distinct from that containing the next two genera on the right hand , which diverged from a com- mon parent at the fifth stage of descent . These five genera ...
... hand have , on this same principle , much in common , and form a subfamily , distinct from that containing the next two genera on the right hand , which diverged from a com- mon parent at the fifth stage of descent . These five genera ...
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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