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 - 458페이지 |
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205 페이지
... according to Schacht , in the nearly horizontal and in the upright branches . In the common rue and some other plants , one flower , usually the central or terminal one , opens first , and has five sepals and petals , and five divisions ...
... according to Schacht , in the nearly horizontal and in the upright branches . In the common rue and some other plants , one flower , usually the central or terminal one , opens first , and has five sepals and petals , and five divisions ...
361 페이지
... according to their mutual affinities , and in the second place according to their periods of existence - do not accord in arrangement . The species extreme in character are not the oldest or the most recent ; nor are those which are ...
... according to their mutual affinities , and in the second place according to their periods of existence - do not accord in arrangement . The species extreme in character are not the oldest or the most recent ; nor are those which are ...
472 페이지
... according to Youatt , in young animals - and the state of the whole flower in the cauliflower . We often see rudi- ments of various parts in monsters ; but I doubt whether any of these cases throw light on the origin of rudimentary ...
... according to Youatt , in young animals - and the state of the whole flower in the cauliflower . We often see rudi- ments of various parts in monsters ; but I doubt whether any of these cases throw light on the origin of rudimentary ...
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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