The Origin of Species by Means of Natural Selection: Or, the Preservation of Favored Races in the Struggle for Life, 1권Hurst, 1890 - 501페이지 |
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28 페이지
... flowers in the different varieties of the same species in the flower - garden ; the diversity of leaves , pods , or tubers , or whatever part is valued , in the kitchen - garden , in comparison with the flowers of the same varieties ...
... flowers in the different varieties of the same species in the flower - garden ; the diversity of leaves , pods , or tubers , or whatever part is valued , in the kitchen - garden , in comparison with the flowers of the same varieties ...
92 페이지
... flowers , it may be objected that pollen could seldom be carried from tree to tree , and at most only from flower to flower on the same tree ; and flowers on the same tree can be considered as distinct individuals only in a limited ...
... flowers , it may be objected that pollen could seldom be carried from tree to tree , and at most only from flower to flower on the same tree ; and flowers on the same tree can be considered as distinct individuals only in a limited ...
204 페이지
... flowers can be intercrossed ; and the benefits which certainly are derived from this pro- cess are thus secured . The closed and imperfect flowers are , however , manifestly of high importance , as they yield with the utmost safety a ...
... flowers can be intercrossed ; and the benefits which certainly are derived from this pro- cess are thus secured . The closed and imperfect flowers are , however , manifestly of high importance , as they yield with the utmost safety a ...
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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