The Origin of Species by Means of Natural Selection,: Or the Preservation of Favoured Races in the Struggle for LifeAppleton, 1898 - 432 páginas |
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Página 10
... South America , all are quite fertile together ; but analogy makes me greatly doubt , whether the sev- eral aboriginal species would at first have freely bred together and have produced quite fertile hybrids . So again I have lately ...
... South America , all are quite fertile together ; but analogy makes me greatly doubt , whether the sev- eral aboriginal species would at first have freely bred together and have produced quite fertile hybrids . So again I have lately ...
Página 61
... South American coasts , which have been upraised several hundred feet within the recent period , than the absence of ... America , no extensive formations with recent or ter- tiary remains can anywhere be found , though the supply of ...
... South American coasts , which have been upraised several hundred feet within the recent period , than the absence of ... America , no extensive formations with recent or ter- tiary remains can anywhere be found , though the supply of ...
Página 62
... South America , which has been bulky enough to resist such degradation as it has as yet suffered , but which will hardly last to a dis- tant geological age , was deposited during a downward oscillation of level , and thus gained ...
... South America , which has been bulky enough to resist such degradation as it has as yet suffered , but which will hardly last to a dis- tant geological age , was deposited during a downward oscillation of level , and thus gained ...
Página 75
... South America . Even throughout the extensive and shallow seas with- in the archipelago , sedimentary beds could hardly be accumulated of great thickness during the periods of elevation , or become capped and protected by subse- quent ...
... South America . Even throughout the extensive and shallow seas with- in the archipelago , sedimentary beds could hardly be accumulated of great thickness during the periods of elevation , or become capped and protected by subse- quent ...
Página 79
... South America and in Europe , as far back as the miocene stage . Had it not been for the rare accident of the pres- ervation of the footsteps in the new red sandstone of the United States , who would have ventured to suppose that no ...
... South America and in Europe , as far back as the miocene stage . Had it not been for the rare accident of the pres- ervation of the footsteps in the new red sandstone of the United States , who would have ventured to suppose that no ...
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Términos y frases comunes
admit affinity allied species ancient animals appear Archipelago arctic areas become believe birds Cambrian changes characters cies classification climate closely allied common progenitor 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 individuals 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 parent parent-form peculiar perfect pistil plants pollen present probably produced quadrupeds reciprocal crosses regions remains remarked reproductive resemblance rocks rudimentary organs sediment seeds Silurian South America stage stamens sterility structure successive suppose terrestrial tertiary theory tion variations varieties whilst widely different wings