The Origin of Species by Means of Natural Selection; Or, the Preservation of Favored Races in the Struggle for Life ...A.L. Burt, 1890 - 538페이지 |
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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 ...
411 페이지
... birds ; of these , twenty - one ( or perhaps twenty - three ) are peculiar , whereas of the eleven marine birds only two are peculiar ; and it is obvious that marine birds could arrive at these islands much more easily and frequently ...
... birds ; of these , twenty - one ( or perhaps twenty - three ) are peculiar , whereas of the eleven marine birds only two are peculiar ; and it is obvious that marine birds could arrive at these islands much more easily and frequently ...
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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 gilt top Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate 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 variability variations varieties vary whole widely different wings young