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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74 페이지
... variations useful to man have undoubtedly occurred , that other variations useful in some way to each being in the great and complex battle of life , should occur in the course of many successive generations ? If such do occur , can we ...
... variations useful to man have undoubtedly occurred , that other variations useful in some way to each being in the great and complex battle of life , should occur in the course of many successive generations ? If such do occur , can we ...
149 페이지
... variations are due to the several races of the pigeon having inherited from a common parent the same constitution and tendency to variation , when acted on by similar unknown influences . In the vegetable kingdom we have a case of ...
... variations are due to the several races of the pigeon having inherited from a common parent the same constitution and tendency to variation , when acted on by similar unknown influences . In the vegetable kingdom we have a case of ...
238 페이지
... variations have often occurred under nature , as are known occasionally to arise under domestication . Of these latter variations several may be attributed to reversion ; and the characters which thus reappear were , it is probable , in ...
... variations have often occurred under nature , as are known occasionally to arise under domestication . Of these latter variations several may be attributed to reversion ; and the characters which thus reappear were , it is probable , in ...
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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