The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for Life: Reprinted from the Sixth London Edition, with All Additions and CorrectionsA. L. Burt Company, 1890 - 538페이지 |
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... 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 on the same plant ; and the pollen of each flower readily gets on its stigma without insect agency ; for I ... flowers , it may be objected that pollen could seldom be carried from tree to tree , and at most only from flower to ...
... flowers on the same plant ; and the pollen of each flower readily gets on its stigma without insect agency ; for I ... flowers , it may be objected that pollen could seldom be carried from tree to tree , and at most only from flower to ...
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 ALEXANDRE DUMAS allied species America ancient appear 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 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 paleozoic parent peculiar perfect pigeons pistil pollen present principle probably produced quadrupeds ranked remarked resemblance rudimentary seeds Silurian SIR WALTER SCOTT slight South America stamens sterility structure successive suppose tend theory tion trees variability variations varieties vary whole widely different wings young