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 45
... closely . allied to that which so frequently affects pure species , when exposed to new and unnatural conditions of ... close relation to species having CHAP . IX . ] 45 SUMMARY .
... closely . allied to that which so frequently affects pure species , when exposed to new and unnatural conditions of ... close relation to species having CHAP . IX . ] 45 SUMMARY .
Página 50
... allied form , such as C. œnas . So , with natural species , if we look to forms very distinct , for instance to the ... closely compared the structure of the parent with that of its modified descendants , unless at the same time we had a ...
... allied form , such as C. œnas . So , with natural species , if we look to forms very distinct , for instance to the ... closely compared the structure of the parent with that of its modified descendants , unless at the same time we had a ...
Página 66
... closely gradu- ated varieties between the allied species which lived at its commencement and at its close . Several cases are on record of the same species presenting varieties in the upper and lower parts of the same formation ; thus ...
... closely gradu- ated varieties between the allied species which lived at its commencement and at its close . Several cases are on record of the same species presenting varieties in the upper and lower parts of the same formation ; thus ...
Página 75
... closely allied species . It is also probable that each great period of subsidence would be interrupted by os- cillations of level , and that slight climatal changes would intervene during such lengthy periods ; and in these CHAP . X ...
... closely allied species . It is also probable that each great period of subsidence would be interrupted by os- cillations of level , and that slight climatal changes would intervene during such lengthy periods ; and in these CHAP . X ...
Página 102
... closely those of the southern hemisphere . So , again , several highly competent observers maintain that the existing productions of the United States are more closely ... allied , and from not including those forms which are found only in ...
... closely those of the southern hemisphere . So , again , several highly competent observers maintain that the existing productions of the United States are more closely ... allied , and from not including those forms which are found only in ...
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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