The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for Life, 2권D. Appleton, 1896 |
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75개의 결과 중 1 - 5개
8 페이지
... animals , much fewer experiments have been carefully tried than with plants . If our systematic arrangements can be trusted , that is , if the genera of animals are as distinct from each other as are the genera of plants , then we may ...
... animals , much fewer experiments have been carefully tried than with plants . If our systematic arrangements can be trusted , that is , if the genera of animals are as distinct from each other as are the genera of plants , then we may ...
9 페이지
... animals , I hardly know of an instance in which two families of the same hybrid have been raised at the same time from different parents , so as to avoid the ill effects of close interbreeding . On the contrary , brothers and sisters ...
... animals , I hardly know of an instance in which two families of the same hybrid have been raised at the same time from different parents , so as to avoid the ill effects of close interbreeding . On the contrary , brothers and sisters ...
10 페이지
... animals , the various races when crossed together are quite fertile ; yet in many cases they are descended from two or more wild species . From this fact we must conclude either that the aboriginal parent - species at first produced ...
... animals , the various races when crossed together are quite fertile ; yet in many cases they are descended from two or more wild species . From this fact we must conclude either that the aboriginal parent - species at first produced ...
11 페이지
... animals , and , considering how scanty our knowledge is in regard to hybrid animals , I have been surprised to find how generally the same rules apply to both kingdoms . It has been already remarked , that the degree of fertility , both ...
... animals , and , considering how scanty our knowledge is in regard to hybrid animals , I have been surprised to find how generally the same rules apply to both kingdoms . It has been already remarked , that the degree of fertility , both ...
25 페이지
... animals and plants are removed from their natural conditions , they are extremely liable to have their reproductive systems seriously affected . This , in fact , is the great bar to the domestication of animals . Between the sterility ...
... animals and plants are removed from their natural conditions , they are extremely liable to have their reproductive systems seriously affected . This , in fact , is the great bar to the domestication of animals . Between the sterility ...
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accumulated adapted admit affinity allied species ancient animals appear Archipelago arctic areas become believe birds breeds Cambrian changes characters classification climate closely allied continent crustaceans degree deposited difficulty distant distinct species domestic doubt embryo Europe existing extinct fact faunas fertilised fertility flowers formations formerly forms fossil fresh-water Fritz Müller Gärtner genera genus geological period geological record Glacial period groups of species habits hybrids hybrids produced important individuals inhabitants inherited insects instance intermediate intervals land larvæ less living mammæ mammals manner marine Marsupials migration modified descendants mongrels mountains natural selection naturalists nearly occur oceanic islands offspring organisation palæontologists paleozoic parent parent-form peculiar perfect pistil plants pollen present probably produced quadrupeds reciprocal crosses regions remains remarked reproductive resemblance rocks rudimentary organs seeds Silurian South America species belonging stage stamens sterility structure successive suppose terrestrial tertiary tion variations varieties whilst widely different wings