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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367 페이지
... fossil mammals , buried there in such numbers , are re- lated to South American types . This relationship is even more clearly seen in the wonderful collection of fossil bones made by MM . Lund and Clausen in the caves of Brazil . I was ...
... fossil mammals , buried there in such numbers , are re- lated to South American types . This relationship is even more clearly seen in the wonderful collection of fossil bones made by MM . Lund and Clausen in the caves of Brazil . I was ...
369 페이지
... fossil state ; that the number both of specimens and of species , preserved in our museums , is absolutely as nothing compared with the number of generations which must have passed away even during a single formation ; that , owing to ...
... fossil state ; that the number both of specimens and of species , preserved in our museums , is absolutely as nothing compared with the number of generations which must have passed away even during a single formation ; that , owing to ...
530 페이지
... fossil , in secondary formation , 335 . insular , 414 . Man , origin of , 504 . Manatee , rudimentary nails of , 471 . Marsupials of Australia , 106 . - , structure of their feet , 450 . Marsupials , fossil species of , 367 . Martens ...
... fossil , in secondary formation , 335 . insular , 414 . Man , origin of , 504 . Manatee , rudimentary nails of , 471 . Marsupials of Australia , 106 . - , structure of their feet , 450 . Marsupials , fossil species of , 367 . Martens ...
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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