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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... continent - Centres of creation - Means of dispersal by changes of climate and of the level of the land , and by occasional means - Dispersal during the Glacial period -Alternate Glacial periods in the North and South . . 129 CHAPTER ...
... continent - Centres of creation - Means of dispersal by changes of climate and of the level of the land , and by occasional means - Dispersal during the Glacial period -Alternate Glacial periods in the North and South . . 129 CHAPTER ...
Página 65
... continent when first broken up into an archipelago ) , and consequently during subsidence , though there will be much extinction , few new varie- ties or species will be formed ; and it is during these very periods of subsidence , that ...
... continent when first broken up into an archipelago ) , and consequently during subsidence , though there will be much extinction , few new varie- ties or species will be formed ; and it is during these very periods of subsidence , that ...
Página 86
... continents of Europe and North America . This same view has since been maintained by Agassiz and others . But we do not know what was the state of things in the intervals be- tween the several successive formations ; whether Europe and ...
... continents of Europe and North America . This same view has since been maintained by Agassiz and others . But we do not know what was the state of things in the intervals be- tween the several successive formations ; whether Europe and ...
Página 87
... continents now stand . Nor should we be justified in assuming that if , for instance , the bed of the Pacific Ocean were now converted into a continent we should there find sedimentary formations in a recognisable condition older than ...
... continents now stand . Nor should we be justified in assuming that if , for instance , the bed of the Pacific Ocean were now converted into a continent we should there find sedimentary formations in a recognisable condition older than ...
Página 91
... continent of Europe , whereas the marine shells and birds have remained unaltered . We can perhaps understand the apparently quicker rate of change in terrestrial and in more highly organised productions compared with marine and lower ...
... continent of Europe , whereas the marine shells and birds have remained unaltered . We can perhaps understand the apparently quicker rate of change in terrestrial and in more highly organised productions compared with marine and lower ...
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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