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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352 페이지
... points as mere superficial sculp- ture . Moreover , other forms , which are not found in the Chalk of Europe , but which occur in the formations either above or below , occur in the same order at these distant points of the world . In ...
... points as mere superficial sculp- ture . Moreover , other forms , which are not found in the Chalk of Europe , but which occur in the formations either above or below , occur in the same order at these distant points of the world . In ...
378 페이지
... points of the earth ́s sur- face . Undoubtedly there are many cases of extreme diffi- culty in understanding how the same species could possi- bly have migrated from some one point to the several dis- tant and isolated points , where ...
... points of the earth ́s sur- face . Undoubtedly there are many cases of extreme diffi- culty in understanding how the same species could possi- bly have migrated from some one point to the several dis- tant and isolated points , where ...
403 페이지
... points so enormously remote as Kerguelen Land , New Zealand , and Fuegia ; but icebergs , as suggested by Lyell , may have been concerned in their dispersal . The existence at these and other distant points of the southern hemisphere ...
... points so enormously remote as Kerguelen Land , New Zealand , and Fuegia ; but icebergs , as suggested by Lyell , may have been concerned in their dispersal . The existence at these and other distant points of the southern hemisphere ...
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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