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 EditionBurt, 1890 - 538페이지 |
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356 페이지
... EXTINCT SPECIES TO EACH OTHER , AND TO LIVING FORMS . Let us now look to the mutual affinities of extinct and living species . All fall into a few grand classes ; and this fact is at once explained on the principle of descent . The more ...
... EXTINCT SPECIES TO EACH OTHER , AND TO LIVING FORMS . Let us now look to the mutual affinities of extinct and living species . All fall into a few grand classes ; and this fact is at once explained on the principle of descent . The more ...
358 페이지
... extinct species , or group of species , being considered as intermediate between any two living species , or groups of species . If by this term it is meant that an extinct form is directly interme- diate in all its characters between ...
... extinct species , or group of species , being considered as intermediate between any two living species , or groups of species . If by this term it is meant that an extinct form is directly interme- diate in all its characters between ...
359 페이지
... extinct and recent , descended from ( A ) , make , as before remarked , one order ; and this order , from the continued effects of extinction and diverg- ence of character , has become divided into several sub- families and families ...
... extinct and recent , descended from ( A ) , make , as before remarked , one order ; and this order , from the continued effects of extinction and diverg- ence of character , has become divided into several sub- families and families ...
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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