The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for Life: Reprinted from the Sixth London Edition, with All Additions and CorrectionsA. L. Burt Company, 1890 - 458페이지 |
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... varieties tend to increase into the greater differences between species . There is one other point which is worth notice . Varie- ties generally have much restricted ranges . This state- ment is indeed scarcely more than a truism , for ...
... varieties tend to increase into the greater differences between species . There is one other point which is worth notice . Varie- ties generally have much restricted ranges . This state- ment is indeed scarcely more than a truism , for ...
70 페이지
... varieties of the same species , the struggle will generally be almost equally severe , and we sometimes see the contest soon decided : for instance , if several varieties of wheat be sown together and the mixed seed be resown , some of ...
... varieties of the same species , the struggle will generally be almost equally severe , and we sometimes see the contest soon decided : for instance , if several varieties of wheat be sown together and the mixed seed be resown , some of ...
305 페이지
... varieties , when crossed with a widely distinct species . He experimented on five forms which are commonly reputed to be varieties , and which he tested by the severest trial , namely , by recipro- cal crosses , and he found their ...
... varieties , when crossed with a widely distinct species . He experimented on five forms which are commonly reputed to be varieties , and which he tested by the severest trial , namely , by recipro- cal crosses , and he found their ...
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adapted admit affinities ALEXANDRE DUMAS allied species America ancient appear 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 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 paleozoic parent peculiar perfect pigeons pistil pollen present principle probably produced quadrupeds ranked remarked resemblance rudimentary seeds Silurian SIR WALTER SCOTT slight South America stamens sterility structure successive suppose tend theory tion trees variability variations varieties vary whole widely different wings young