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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82 페이지
... males , accord- to their standard of beauty , might produce a marked effect . Some well - known laws , with respect to the pumage of male and female birds , in comparison with the plumage of the young , can partly be explained through ...
... males , accord- to their standard of beauty , might produce a marked effect . Some well - known laws , with respect to the pumage of male and female birds , in comparison with the plumage of the young , can partly be explained through ...
83 페이지
... males having had , in successive generations , some slight advantage over other males , in their weapons , means of ... male sex , which apparently have not been augmented through selection by man . The tuft of hair on the breast of the ...
... males having had , in successive generations , some slight advantage over other males , in their weapons , means of ... male sex , which apparently have not been augmented through selection by man . The tuft of hair on the breast of the ...
87 페이지
... male tree , I put the stigmas of twenty flowers , taken from different branches , under the microscope , and on all , without exception , there were a few pollen - grains , and on some a profusion . As the wind had set for several days ...
... male tree , I put the stigmas of twenty flowers , taken from different branches , under the microscope , and on all , without exception , there were a few pollen - grains , and on some a profusion . As the wind had set for several days ...
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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