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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144 페이지
... period when the several species branched off from the common progenitor of the genus . This period will seldom be remote in any extreme degree , as species rarely endure for more than one geolog- ical period . An extraordinary amount of ...
... period when the several species branched off from the common progenitor of the genus . This period will seldom be remote in any extreme degree , as species rarely endure for more than one geolog- ical period . An extraordinary amount of ...
400 페이지
... period , as measured by years , must have been very long ; and when we remem- ber over what vast spaces some naturalized plants and ani- mals have spread within a few centuries , this period will have been ample for any amount of ...
... period , as measured by years , must have been very long ; and when we remem- ber over what vast spaces some naturalized plants and ani- mals have spread within a few centuries , this period will have been ample for any amount of ...
461 페이지
... period of life each variation may have been caused , but at what period the effects are displayed . The cause may have acted , and I believe often has acted , on one or both par- ents before the act of generation . It deserves notice ...
... period of life each variation may have been caused , but at what period the effects are displayed . The cause may have acted , and I believe often has acted , on one or both par- ents before the act of generation . It deserves notice ...
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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