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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78 페이지
... color to each kind of grouse , and in keeping that color , when once acquired , true and constant . Nor ought we to think that the oc- casional destruction of an animal of any particular color would produce little effect ; we should ...
... color to each kind of grouse , and in keeping that color , when once acquired , true and constant . Nor ought we to think that the oc- casional destruction of an animal of any particular color would produce little effect ; we should ...
154 페이지
... color appears from what is commonly called chance , that I was led solely from the occurrence of the face - stripes on this hybrid from the ass and hemionus to ask Colonel Poole whether such face - stripes ever occurred in the eminently ...
... color appears from what is commonly called chance , that I was led solely from the occurrence of the face - stripes on this hybrid from the ass and hemionus to ask Colonel Poole whether such face - stripes ever occurred in the eminently ...
215 페이지
... color , but extends to form , and even to the manner in which the insects hold themselves . The caterpillars which project motionless like dead twigs from the bushes on which they feed , offer an excellent instance of a resem- blance of ...
... color , but extends to form , and even to the manner in which the insects hold themselves . The caterpillars which project motionless like dead twigs from the bushes on which they feed , offer an excellent instance of a resem- blance of ...
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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