The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJohn Murray, 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 ...
393 페이지
... period . At this , the newer Pliocene period , the majority of the in- habitants of the world were specifically the same as now , and we have good reason to believe that the climate was warmer than at the present day . Hence , we may ...
... period . At this , the newer Pliocene period , the majority of the in- habitants of the world were specifically the same as now , and we have good reason to believe that the climate was warmer than at the present day . Hence , we may ...
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 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