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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305 페이지
... offspring perfectly fertile . But one of these five varieties , when used either as the father or mother , and crossed with the Nico- tiana glutinosa ... offspring of species , and the so - called mongrel offspring WHEN CROSSED . 305.
... offspring perfectly fertile . But one of these five varieties , when used either as the father or mother , and crossed with the Nico- tiana glutinosa ... offspring of species , and the so - called mongrel offspring WHEN CROSSED . 305.
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 ...
478 페이지
... offspring . On the one side , there is good reason to believe that slight changes in the conditions of life give vigor and fertility to all organic beings . We know also that a cross between the distinct individuals of the same variety ...
... offspring . On the one side , there is good reason to believe that slight changes in the conditions of life give vigor and fertility to all organic beings . We know also that a cross between the distinct individuals of the same variety ...
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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