The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life, Volumen2D. Appleton, 1898 |
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Página 67
... migration due to climatal and other changes ; and when we see a species first appearing in any formation , the probabil- ity is that it only then first immigrated into that area . It is well - known , for instance , that several species ...
... migration due to climatal and other changes ; and when we see a species first appearing in any formation , the probabil- ity is that it only then first immigrated into that area . It is well - known , for instance , that several species ...
Página 68
... migrations of species and to geographical changes . And in the distant future , a geologist , ex- amining these beds , would be tempted to conclude that the average duration of life of the embedded fossils had been less than that of the ...
... migrations of species and to geographical changes . And in the distant future , a geologist , ex- amining these beds , would be tempted to conclude that the average duration of life of the embedded fossils had been less than that of the ...
Página 76
... migrate , and no closely consecutive record of their modifications could be preserved in any one formation . Very many of the marine inhabitants of the archi- pelago now range thousands of miles beyond its con- fines ; and analogy ...
... migrate , and no closely consecutive record of their modifications could be preserved in any one formation . Very many of the marine inhabitants of the archi- pelago now range thousands of miles beyond its con- fines ; and analogy ...
Página 90
... migration from a distinct geographical province , seems satisfactory . These several facts accord well with our theory , which includes no fixed law of development , causing all. 90 [ CHAP . XI . THE GEOLOGICAL SUCCESSION.
... migration from a distinct geographical province , seems satisfactory . These several facts accord well with our theory , which includes no fixed law of development , causing all. 90 [ CHAP . XI . THE GEOLOGICAL SUCCESSION.
Página 105
... migration from other parts of the world . As we have reason to be- lieve that large areas are affected by the same move- ment , it is probable that strictly contemporaneous for- mations have often been accumulated over very wide spaces ...
... migration from other parts of the world . As we have reason to be- lieve that large areas are affected by the same move- ment , it is probable that strictly contemporaneous for- mations have often been accumulated over very wide spaces ...
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Términos y frases comunes
admit affinity allied species ancient animals appear Archipelago arctic areas become believe belonging birds Cambrian changes characters cies classification climate closely allied 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 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 palæontologists Palæozoic 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 stage stamens sterility structure successive suppose terrestrial tertiary theory tion variations varieties whilst whole widely different wings