The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, 1권Hurst, 1890 - 501페이지 |
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365 페이지
... present time both groups are greatly reduced , while others , intermediate in organi- zation , have largely increased ; consequently some natu- ralists maintain that molluscs were formerly more highly developed than at present ; but a ...
... present time both groups are greatly reduced , while others , intermediate in organi- zation , have largely increased ; consequently some natu- ralists maintain that molluscs were formerly more highly developed than at present ; but a ...
368 페이지
... present climate of Australia and of parts of South America , under the same latitude , would attempt to account , on ... present character of the southern half of the continent ; and the southern half was formerly more closely allied ...
... present climate of Australia and of parts of South America , under the same latitude , would attempt to account , on ... present character of the southern half of the continent ; and the southern half was formerly more closely allied ...
393 페이지
... present day , the sub - arctic and northern temperate pro- ductions of the Old and New Worlds are separated from each other by the whole Atlantic Ocean and by the north- ern part of the Pacific . During the Glacial period , when the ...
... present day , the sub - arctic and northern temperate pro- ductions of the Old and New Worlds are separated from each other by the whole Atlantic Ocean and by the north- ern part of the Pacific . During the Glacial period , when 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 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 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 trees variability variations varieties vary whole widely different wings young