The Origin of Species by Means of Natural Selection, Or, The Preservation of Favored Races in the Struggle for Life, Выпуск 5D. Appleton, 1896 |
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Стр. 10
... domestic dogs of South America , all are quite fertile together ; but analogy makes me greatly doubt , whether the several aboriginal species would at first have freely bred together and have produced quite fertile hybrids . So again I ...
... domestic dogs of South America , all are quite fertile together ; but analogy makes me greatly doubt , whether the several aboriginal species would at first have freely bred together and have produced quite fertile hybrids . So again I ...
Стр. 35
... domestic races , differing widely from each other in appearance , for instance those of the pigeon , or of the cabbage , is a remarkable fact ; more especially when we reflect how many species there are , which , though resembling each ...
... domestic races , differing widely from each other in appearance , for instance those of the pigeon , or of the cabbage , is a remarkable fact ; more especially when we reflect how many species there are , which , though resembling each ...
Стр. 36
... domestic varieties have not become mutually infertile when crossed , but why this has so generally occurred with natural varieties , as soon as they have been permanently modified in a sufficient degree to take rank as species . We are ...
... domestic varieties have not become mutually infertile when crossed , but why this has so generally occurred with natural varieties , as soon as they have been permanently modified in a sufficient degree to take rank as species . We are ...
Стр. 39
... domestic varieties , and from such varieties not having been exposed for very long periods to uniform conditions of life ; —from these several considerations we may conclude that fertility does not constitute a fundamental distinction ...
... domestic varieties , and from such varieties not having been exposed for very long periods to uniform conditions of life ; —from these several considerations we may conclude that fertility does not constitute a fundamental distinction ...
Стр. 40
... domestic varieties ( very few experiments having been tried on natural varieties ) , and this implies that there has been recent variability , which would often continue and would augment that arising from the act of crossing . The ...
... domestic varieties ( very few experiments having been tried on natural varieties ) , and this implies that there has been recent variability , which would often continue and would augment that arising from the act of crossing . The ...
Другие издания - Просмотреть все
The Origin of Species by Means of Natural Selection: Or, The ..., Том 2 Charles Darwin Полный просмотр - 1888 |
The Origin of Species by Means of Natural Selection, Or, The ..., Том 2 Charles Darwin Полный просмотр - 1896 |
The Origin of Species by Means of Natural Selection, Or, The ..., Том 2 Charles Darwin Полный просмотр - 1896 |
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accumulated adapted admit affinity allied species ancient animals appear Archipelago arctic areas become beds 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 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