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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112 페이지
... offspring of a species get into some distinct country , or become quickly adapted to some quite new station , in which offspring and progen- itor do not come into competition , both may continue to exist . If , then , our diagram be ...
... offspring of a species get into some distinct country , or become quickly adapted to some quite new station , in which offspring and progen- itor do not come into competition , both may continue to exist . If , then , our diagram be ...
310 페이지
... offspring . The facts given on the sterility of the illegitimate unions of dimorphic and trimorphic plants and of their illegitimate progeny , perhaps render it probable that some unknown bond in all cases connects the degree of ...
... offspring . The facts given on the sterility of the illegitimate unions of dimorphic and trimorphic plants and of their illegitimate progeny , perhaps render it probable that some unknown bond in all cases connects the degree of ...
491 페이지
... offspring should follow the same complex laws in their degrees and kinds of resemblance to their parents - in being absorbed into each . other by successive crosses , and in other such points - as do the crossed offspring of ...
... offspring should follow the same complex laws in their degrees and kinds of resemblance to their parents - in being absorbed into each . other by successive crosses , and in other such points - as do the crossed offspring of ...
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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