The Origin of Species by Means of Natural Selection: Or, The Preservation of Favoured Races in the Struggle for LifeJohn Murray, 1890 - 458페이지 |
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82 페이지
... male stag - beetles sometimes bear wounds from the huge mandibles of other males ; the males of certain hymenopterous insects have been frequently seen by that inimitable observer M. Fabre , fighting for a particular female who sits by ...
... male stag - beetles sometimes bear wounds from the huge mandibles of other males ; the males of certain hymenopterous insects have been frequently seen by that inimitable observer M. Fabre , fighting for a particular female who sits by ...
83 페이지
... males and females of any animal have the same general habits of life , but differ in structure , color , or ornament ... male sex , which apparently have not been augmented through selection by man . The tuft of hair on the breast of the ...
... males and females of any animal have the same general habits of life , but differ in structure , color , or ornament ... male sex , which apparently have not been augmented through selection by man . The tuft of hair on the breast of the ...
87 페이지
... male flowers , which have four stamens producing a rather small quan- tity of pollen , and a rudimentary pistil ; other holly - trees bear only female flowers ; these have a full - sized pistil , and four stamens with shrivelled anthers ...
... male flowers , which have four stamens producing a rather small quan- tity of pollen , and a rudimentary pistil ; other holly - trees bear only female flowers ; these have a full - sized pistil , and four stamens with shrivelled anthers ...
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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