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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Charles Darwin. that species have been endowed with sterility simply to prevent their becoming confounded in nature ? I think not . For why should the sterility be so extremely different in degree , when various species are crossed , all ...
Charles Darwin. that species have been endowed with sterility simply to prevent their becoming confounded in nature ? I think not . For why should the sterility be so extremely different in degree , when various species are crossed , all ...
24 페이지
... become nearly mature , but the young chickens had been unable to break through the shell . Of the chickens which ... becoming acquainted with these facts , I was unwilling to believe in the frequent early death of hybrid embryos ; for ...
... become nearly mature , but the young chickens had been unable to break through the shell . Of the chickens which ... becoming acquainted with these facts , I was unwilling to believe in the frequent early death of hybrid embryos ; for ...
28 페이지
... become widely or specifically different , produce hybrids which are almost always in some degree sterile . I am fully persuaded that this double parallelism is by no means an accident or an illusion . He who is able to explain why the ...
... become widely or specifically different , produce hybrids which are almost always in some degree sterile . I am fully persuaded that this double parallelism is by no means an accident or an illusion . He who is able to explain why the ...
35 페이지
... become perfectly fertile together . With plants , so far is cultivation from giving a tendency towards sterility between distinct species , that in several well - authenticated cases already alluded to , certain plants have been ...
... become perfectly fertile together . With plants , so far is cultivation from giving a tendency towards sterility between distinct species , that in several well - authenticated cases already alluded to , certain plants have been ...
36 페이지
... becomes in the highest degree improbable that similar conditions long - continued should likewise induce this ... become mutually infertile when crossed , but why this has so generally occurred with natural varieties , as soon as ...
... becomes in the highest degree improbable that similar conditions long - continued should likewise induce this ... become mutually infertile when crossed , but why this has so generally occurred with natural varieties , as soon as ...
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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