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 - 538페이지 |
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53 페이지
... species of the large genera which present any varieties , invariably present a larger average number of varieties than do the species of the small genera . Both these results follow when another division is made , and when all the least ...
... species of the large genera which present any varieties , invariably present a larger average number of varieties than do the species of the small genera . Both these results follow when another division is made , and when all the least ...
55 페이지
... species , their denominations would be reversed . But there is reason to believe that the species which are very closely allied to other species , and in so far resemble varieties , often have much restricted ranges . For instance , Mr ...
... species , their denominations would be reversed . But there is reason to believe that the species which are very closely allied to other species , and in so far resemble varieties , often have much restricted ranges . For instance , Mr ...
486 페이지
... species are only strongly marked and permanent varieties , and that each species first existed as a variety , we can see why it is that no line of demarcation can be drawn between species , commonly supposed to have been produced by ...
... species are only strongly marked and permanent varieties , and that each species first existed as a variety , we can see why it is that no line of demarcation can be drawn between species , commonly supposed to have been produced by ...
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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