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
... 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 acquired ...
... 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 acquired ...
Página 59
... America ; but now land - shells have been found in the lias . In regard to mammiferous remains , a glance at the historical table published in Lyell's Manual will bring home the truth , how accidental and rare is their preservation ...
... America ; but now land - shells have been found in the lias . In regard to mammiferous remains , a glance at the historical table published in Lyell's Manual will bring home the truth , how accidental and rare is their preservation ...
Página 60
... America , and in many other parts of the world . The most skilful geologist , if his attention had been confined exclusively to these large territories , would never have suspected that , during the periods which were blank and barren ...
... America , and in many other parts of the world . The most skilful geologist , if his attention had been confined exclusively to these large territories , would never have suspected that , during the periods which were blank and barren ...
Página 61
... America , no extensive formations with recent or ter- tiary remains can anywhere be found , though the supply of sediment must for ages have been great , from the enormous degradation of the coast - rocks and from muddy streams entering ...
... America , no extensive formations with recent or ter- tiary remains can anywhere be found , though the supply of sediment must for ages have been great , from the enormous degradation of the coast - rocks and from muddy streams entering ...
Página 62
... 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 considerable ...
... 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 considerable ...
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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