The Origin of Species by Means of Natural Selection; Or, the Preservation of Favored Races in the Struggle for Life ...A.L. Burt, 1890 - 538페이지 |
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110 페이지
... modification . Nor do I suppose that the most divergent varieties are invariably preserved : a medium form may often long endure , and may or may not produce more than one modified descendant ; for natural selection will always act ...
... modification . Nor do I suppose that the most divergent varieties are invariably preserved : a medium form may often long endure , and may or may not produce more than one modified descendant ; for natural selection will always act ...
201 페이지
... modified at the same time through variation and natural selection ? But there is no necessity for supposing that all the parts of any being have been simultaneously modified . The most striking modifications , excellently adapted for ...
... modified at the same time through variation and natural selection ? But there is no necessity for supposing that all the parts of any being have been simultaneously modified . The most striking modifications , excellently adapted for ...
463 페이지
... modified through natural selection for different habits . Then , from the many slight successive variations having supervened in the several species at a not early age , and having been inherited at a corresponding age , the young will ...
... modified through natural selection for different habits . Then , from the many slight successive variations having supervened in the several species at a not early age , and having been inherited at a corresponding age , the young will ...
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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 gilt top Glacial period gradations greater number groups of species habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intercrossing intermediate 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 variability variations varieties vary whole widely different wings young