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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381 페이지
... means of dispersal . MEANS OF DISPERSAL . Sir C. Lyell and other authors have ably treated this subject . I can give here only the briefest abstract of the more important facts . Change of climate must have had a powerful influence on ...
... means of dispersal . MEANS OF DISPERSAL . Sir C. Lyell and other authors have ably treated this subject . I can give here only the briefest abstract of the more important facts . Change of climate must have had a powerful influence on ...
389 페이지
... means become mingled ; but would remain as distinct as they now are . The currents , from their course , would never bring seeds from North America to Britain , though they might and do bring seeds from the West Indies to our western ...
... means become mingled ; but would remain as distinct as they now are . The currents , from their course , would never bring seeds from North America to Britain , though they might and do bring seeds from the West Indies to our western ...
524 페이지
... means of , 381 . during Glacial period , 389 . Distribution , geographical , 373 . means of , 381 . Disuse , effect of , under nature , 128 . Diversification of means for same general purpose , 182 . Division , physiological , of labor ...
... means of , 381 . during Glacial period , 389 . Distribution , geographical , 373 . means of , 381 . Disuse , effect of , under nature , 128 . Diversification of means for same general purpose , 182 . Division , physiological , of labor ...
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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 divergence domestic doubt effects eggs embryo existing extinct extremely facts favorable fertility flowers formation forms fossil Fritz Müller genera genus geological geological period Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced 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 occasionally 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