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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1 페이지
... naturalists is that species , when intercrossed , have been specially endowed with sterility , in order to prevent their confusion . This view certainly seems at first highly probable , for species living together could hardly have been ...
... naturalists is that species , when intercrossed , have been specially endowed with sterility , in order to prevent their confusion . This view certainly seems at first highly probable , for species living together could hardly have been ...
34 페이지
... naturalists . as species . For instance , the blue and red pimpernel , which are considered by most botanists as varieties , are said by Gärtner to be quite sterile when crossed , and he consequently ranks them as undoubted species . If ...
... naturalists . as species . For instance , the blue and red pimpernel , which are considered by most botanists as varieties , are said by Gärtner to be quite sterile when crossed , and he consequently ranks them as undoubted species . If ...
70 페이지
... naturalists have no golden rule by which to distinguish species and varieties ; they grant some little variability to each species , but when they meet with a somewhat greater amount of difference between any two forms , they rank both ...
... naturalists have no golden rule by which to distinguish species and varieties ; they grant some little variability to each species , but when they meet with a somewhat greater amount of difference between any two forms , they rank both ...
71 페이지
... naturalists have been misled by their imaginations , and that these late tertiary species really present no difference whatever from their living representatives , or unless we admit , in opposition to the judgment of most naturalists ...
... naturalists have been misled by their imaginations , and that these late tertiary species really present no difference whatever from their living representatives , or unless we admit , in opposition to the judgment of most naturalists ...
96 페이지
... naturalist would have felt the least surprise at its rarity ; for rarity is the attribute of a vast number of species of all classes , in all countries . If we ask ourselves why this or that species is rare , we answer that something is ...
... naturalist would have felt the least surprise at its rarity ; for rarity is the attribute of a vast number of species of all classes , in all countries . If we ask ourselves why this or that species is rare , we answer that something is ...
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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