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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54 페이지
... amount of difference between them , judging by anal- ogy whether or not the amount suffices to raise one or both to the rank of species . Hence the amount of difference is one very important criterion in settling whether two forms ...
... amount of difference between them , judging by anal- ogy whether or not the amount suffices to raise one or both to the rank of species . Hence the amount of difference is one very important criterion in settling whether two forms ...
111 페이지
... amount of divergent modification may have been augmented . This case would be represented in the diagram , if all the lines proceeding from ( A ) were removed , excepting that from a1 to a10 . In the same way the English racehorse and ...
... amount of divergent modification may have been augmented . This case would be represented in the diagram , if all the lines proceeding from ( A ) were removed , excepting that from a1 to a10 . In the same way the English racehorse and ...
144 페이지
... amount of modification implies an unusually large and long - continued amount of variability , which has continually been accumulated by natural selection for the benefit of the species . But as the variability of the extraordinarily ...
... amount of modification implies an unusually large and long - continued amount of variability , which has continually been accumulated by natural selection for the benefit of the species . But as the variability of the extraordinarily ...
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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