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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162 페이지
... existing in lesser numbers would , as already remarked , run a greater chance of being exterminated than one existing in large numbers ; and in this particular case the intermediate form would be eminently liable to the inroads of ...
... existing in lesser numbers would , as already remarked , run a greater chance of being exterminated than one existing in large numbers ; and in this particular case the intermediate form would be eminently liable to the inroads of ...
357 페이지
... existing gencra . Cuvier ranked the Ruminants and Pachyderms as two of the most distinct orders of mammals ; but so many fossil links have been dis- entombed that Owen has had to alter the whole classifica- tion , and has placed certain ...
... existing gencra . Cuvier ranked the Ruminants and Pachyderms as two of the most distinct orders of mammals ; but so many fossil links have been dis- entombed that Owen has had to alter the whole classifica- tion , and has placed certain ...
436 페이지
... existing species descended from A be ranked in the same genus with the parent A , or those from I with parent I. But the existing genus F14 may be supposed to have been but slightly mod- ified , and it will then rank with the parent ...
... existing species descended from A be ranked in the same genus with the parent A , or those from I with parent I. But the existing genus F14 may be supposed to have been but slightly mod- ified , and it will then rank with the parent ...
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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 divergence domestic doubt effects eggs embryo existing extinct extremely facts favorable 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 occasionally 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