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 - 458페이지 |
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246 페이지
... birds , which vary partly in dependence on the situations chosen , and on the nature and temperature of the country inhabited , but often from causes wholly unknown to us . Audubon has given several remarkable cases of differences in ...
... birds , which vary partly in dependence on the situations chosen , and on the nature and temperature of the country inhabited , but often from causes wholly unknown to us . Audubon has given several remarkable cases of differences in ...
251 페이지
... birds which have been known occasionally to lay their eggs in other birds ' nests . Now let us suppose that the ancient progenitor of our European cuckoo had the habits of the American cuckoo , and that she occasionally laid an egg in ...
... birds which have been known occasionally to lay their eggs in other birds ' nests . Now let us suppose that the ancient progenitor of our European cuckoo had the habits of the American cuckoo , and that she occasionally laid an egg in ...
386 페이지
... bird in this interval might easily be blown to the distance of five hundred miles , and hawks are known to look out for tired birds , and the contents of their torn crops might thus readily get scattered . Some hawks and owls bolt their ...
... bird in this interval might easily be blown to the distance of five hundred miles , and hawks are known to look out for tired birds , and the contents of their torn crops might thus readily get scattered . Some hawks and owls bolt their ...
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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