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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326 페이지
... migration due to climatal and other changes ; and when we see a species first appearing in any formation , the probability is that it only then first immigrated into that area . It is well - known , for instance , that several species ...
... migration due to climatal and other changes ; and when we see a species first appearing in any formation , the probability is that it only then first immigrated into that area . It is well - known , for instance , that several species ...
377 페이지
... migrate in a body into a new and afterward isolated country , they would be little liable to modification ; for neither migration nor isolation in themselves effect any thing . These principles come into play only by bringing organisms ...
... migrate in a body into a new and afterward isolated country , they would be little liable to modification ; for neither migration nor isolation in themselves effect any thing . These principles come into play only by bringing organisms ...
391 페이지
... migration when the cold came on , and the re - migration on the return- ing warmth , would generally have been due south and north . The Alpine plants , for example , of Scotland , as remarked by Mr. H. C. Watson , and those of the ...
... migration when the cold came on , and the re - migration on the return- ing warmth , would generally have been due south and north . The Alpine plants , for example , of Scotland , as remarked by Mr. H. C. Watson , and those of the ...
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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