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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148 페이지
... PRESENT ANALOGOUS VARIATIONS , S THAT A VARIETY OF ONE SPECIES OFTEN ASSUMES A CHARACTER PROPER TO AN ALLIED SPECIES ... present sub - varie- ties with reversed feathers on the head , and with feathers on the feet , characters not ...
... PRESENT ANALOGOUS VARIATIONS , S THAT A VARIETY OF ONE SPECIES OFTEN ASSUMES A CHARACTER PROPER TO AN ALLIED SPECIES ... present sub - varie- ties with reversed feathers on the head , and with feathers on the feet , characters not ...
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 character of the southern half of the continent ; and the southern half was formerly more closely allied , than it is at present , to the northern half . In a similar manner we know , from Fal- coner and Cautley's discoveries ...
... present character of the southern half of the continent ; and the southern half was formerly more closely allied , than it is at present , to the northern half . In a similar manner we know , from Fal- coner and Cautley's discoveries ...
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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