The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life, 2권D. Appleton, 1898 |
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... forms of life throughout the world - On the affinities of extinct species to each other and to living species - On the state of development of ancient forms- On the succession of the same types within the same areas- Summary of ...
... forms of life throughout the world - On the affinities of extinct species to each other and to living species - On the state of development of ancient forms- On the succession of the same types within the same areas- Summary of ...
3 페이지
... forms , considered by most authors as distinct species , quite fertile to- gether , he unhesitatingly ranks them as varieties . Gärt- ner , also , makes the rule equally universal ; and he dis- putes the entire fertility of Kölreuter's ...
... forms , considered by most authors as distinct species , quite fertile to- gether , he unhesitatingly ranks them as varieties . Gärt- ner , also , makes the rule equally universal ; and he dis- putes the entire fertility of Kölreuter's ...
4 페이지
... forms , such as the common red and blue pimpernels ( Anagallis arvensis and cœrulea ) , which the best botanists ... forms . It is also most instructive to compare - but I have not space here to enter on details - the evidence advanced ...
... forms , such as the common red and blue pimpernels ( Anagallis arvensis and cœrulea ) , which the best botanists ... forms . It is also most instructive to compare - but I have not space here to enter on details - the evidence advanced ...
21 페이지
... form should have been rendered utterly impotent on a second form , whilst at the same time the male element of this second form is enabled freely to fertilise the first form ; for this peculiar state of the reproductive system could ...
... form should have been rendered utterly impotent on a second form , whilst at the same time the male element of this second form is enabled freely to fertilise the first form ; for this peculiar state of the reproductive system could ...
29 페이지
... forms , which exist in about equal numbers and which differ in no respect except in their reproductive organs ; one ... forms likewise differing in the lengths of their pistils and stamens , in the size and colour of the pollen - grains ...
... forms , which exist in about equal numbers and which differ in no respect except in their reproductive organs ; one ... forms likewise differing in the lengths of their pistils and stamens , in the size and colour of the pollen - grains ...
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admit affinity allied species ancient animals appear Archipelago arctic areas become believe belonging birds Cambrian changes characters cies classification climate closely allied continent crustaceans degree deposited difficulty distant distinct species domestic doubt embryo eral 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 inhabitants inherited insects instance intermediate intervals land larvæ less living mammals manner marine Marsupials migration modified descendants mongrels mountains natural selection naturalists nearly occur oceanic islands offspring organisation palæontologists Palæozoic 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 stage stamens sterility structure successive suppose terrestrial tertiary theory tion variations varieties whilst whole widely different wings