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 74
... suppose to be there accumulating . Not many of the strictly littoral animals , or of those which lived on naked submarine rocks , would be embedded ; and those embedded in gravel or sand would not en- dure to a distant epoch . Wherever ...
... suppose to be there accumulating . Not many of the strictly littoral animals , or of those which lived on naked submarine rocks , would be embedded ; and those embedded in gravel or sand would not en- dure to a distant epoch . Wherever ...
Página 79
... suppose that no less than at least thirty different bird - like animals , some of gigantic size , existed during that period ? Not a fragment of bone has been discovered in these beds . Not long ago , palæontologists maintained that the ...
... suppose that no less than at least thirty different bird - like animals , some of gigantic size , existed during that period ? Not a fragment of bone has been discovered in these beds . Not long ago , palæontologists maintained that the ...
Página 81
... in some one sea , have spread widely . Nor have we any right to suppose that the seas of the world have always been so freely open from south to north as they are at present . Even at this CHAP . X. ] GROUPS OF ALLIED SPECIES . 81.
... in some one sea , have spread widely . Nor have we any right to suppose that the seas of the world have always been so freely open from south to north as they are at present . Even at this CHAP . X. ] GROUPS OF ALLIED SPECIES . 81.
Página 105
... suppose that the inhabitants of each region underwent a considerable amount of modification and extinction , and that there was much migration from other parts of the world . As we have reason to be- lieve that large areas are affected ...
... suppose that the inhabitants of each region underwent a considerable amount of modification and extinction , and that there was much migration from other parts of the world . As we have reason to be- lieve that large areas are affected ...
Página 110
... suppose that the numbered letters in italics represent genera ; and the dotted lines diverging from them the species in each genus . The diagram is much too simple , too few genera and too few species be- ing given , but this is ...
... suppose that the numbered letters in italics represent genera ; and the dotted lines diverging from them the species in each genus . The diagram is much too simple , too few genera and too few species be- ing given , but this is ...
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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