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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62 페이지
... single one . But this difference does not determine how many individuals of the two species can be supported in a district . A large number of eggs is of some im- portance to those species which depend on a fluctuating amount of food ...
... single one . But this difference does not determine how many individuals of the two species can be supported in a district . A large number of eggs is of some im- portance to those species which depend on a fluctuating amount of food ...
66 페이지
... single instance , which , though a simple one , interested me . In Staffordshire , on the estate of a relation , where I had ample means of investigation , there was a large and extremely barren heath , which had never been touched by ...
... single instance , which , though a simple one , interested me . In Staffordshire , on the estate of a relation , where I had ample means of investigation , there was a large and extremely barren heath , which had never been touched by ...
84 페이지
... single strongly marked variation having been preserved . In former editions of this work I sometimes spoke as if · this latter alternative had frequently occurred . I saw the great importance of individual differences , and this led me ...
... single strongly marked variation having been preserved . In former editions of this work I sometimes spoke as if · this latter alternative had frequently occurred . I saw the great importance of individual differences , and this led me ...
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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