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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15 페이지
... descended from distinct species . In the case of strongly marked races of some other domesticated species , there is presumptive or even strong evidence that all are descended from a single wild stock . It has often been assumed that ...
... descended from distinct species . In the case of strongly marked races of some other domesticated species , there is presumptive or even strong evidence that all are descended from a single wild stock . It has often been assumed that ...
429 페이지
... descended from ( A ) , form an order distinct from the genera descended from ( I ) . So that we here have many species descended from a single progenitor grouped into genera ; and the genera into subfamilies , families and orders , all ...
... descended from ( A ) , form an order distinct from the genera descended from ( I ) . So that we here have many species descended from a single progenitor grouped into genera ; and the genera into subfamilies , families and orders , all ...
436 페이지
... descended from some still earlier form . three of these genera ( A , F and I ) , a species has trans- mitted ... descended from A , now broken up into two or three families , consti- tute a distinct order from those descended from I ...
... descended from some still earlier form . three of these genera ( A , F and I ) , a species has trans- mitted ... descended from A , now broken up into two or three families , consti- tute a distinct order from those descended from I ...
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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