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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346 페이지
... successive varia- tions would almost certainly be in some degree different , and the newly - formed variety would probably inherit from its progenitor some characteristic differences . Groups of species , that this , genera and families ...
... successive varia- tions would almost certainly be in some degree different , and the newly - formed variety would probably inherit from its progenitor some characteristic differences . Groups of species , that this , genera and families ...
352 페이지
... successive palæozoic formations of Russia , Western Europe , and North America , a similar parallelism in the forms of life has been observed by several authors ; so it is , according to Lyell , with the European and North American ...
... successive palæozoic formations of Russia , Western Europe , and North America , a similar parallelism in the forms of life has been observed by several authors ; so it is , according to Lyell , with the European and North American ...
463 페이지
... successive variations having supervened in the several species at a not early age , and having been inherited at a corresponding age , the young will have been but little modified , and they will still resemble each other much more ...
... successive variations having supervened in the several species at a not early age , and having been inherited at a corresponding age , the young will have been but little modified , and they will still resemble each other much 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 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