The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, 1권Hurst, 1890 - 501페이지 |
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239 페이지
... Look at the many out- lying islands round a continent , and see how many of their inhabitants can be raised only to the rank of doubtful species . So it is if we look to past times , and compare the species which have just passed away ...
... Look at the many out- lying islands round a continent , and see how many of their inhabitants can be raised only to the rank of doubtful species . So it is if we look to past times , and compare the species which have just passed away ...
365 페이지
... look at the selaceans or sharks , from their approach in some important points of structure to reptiles , as the high- est fish ; others look at the teleosteans as the highest . The ganoids stand intermediate between the selaceans and ...
... look at the selaceans or sharks , from their approach in some important points of structure to reptiles , as the high- est fish ; others look at the teleosteans as the highest . The ganoids stand intermediate between the selaceans and ...
376 페이지
... look to the waters , and we do not find the beaver or muskrat , but the coypu and capybara , rodents of the South American type . Innumerable other instances could be given . If we look to the islands off the American shore , however ...
... look to the waters , and we do not find the beaver or muskrat , but the coypu and capybara , rodents of the South American type . Innumerable other instances could be given . If we look to the islands off the American shore , however ...
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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