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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353 페이지
... South America or in Australia , the most skillful naturalist would hardly be able to say whether the present or the pleistocene inhabitants of Europe resembled most closely those of the southern hemi- sphere . So , again , several ...
... South America or in Australia , the most skillful naturalist would hardly be able to say whether the present or the pleistocene inhabitants of Europe resembled most closely those of the southern hemi- sphere . So , again , several ...
368 페이지
... American types should have been solely produced in South America . For we know that Europe in ancient times was peopled by numerous marsupials ; and I have shown in the publications above alluded to , that in Amer- ica the law of ...
... American types should have been solely produced in South America . For we know that Europe in ancient times was peopled by numerous marsupials ; and I have shown in the publications above alluded to , that in Amer- ica the law of ...
374 페이지
... South America south of latitude 35 degrees with those north of 25 degrees , which consequently are separated by a space of ten degrees of latitude , and are exposed to considerably different conditions ; yet they are incomparably more ...
... South America south of latitude 35 degrees with those north of 25 degrees , which consequently are separated by a space of ten degrees of latitude , and are exposed to considerably different conditions ; yet they are incomparably more ...
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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