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 64
... former protecting mantle of rock may not have been very thick . Admitting then that gneiss , mica - schist , granite , diorite , & c . , were once necessarily covered up , how can we account for the naked and extensive areas of such ...
... former protecting mantle of rock may not have been very thick . Admitting then that gneiss , mica - schist , granite , diorite , & c . , were once necessarily covered up , how can we account for the naked and extensive areas of such ...
Página 73
... distinct from other allied genera . What geological research has not revealed , is the former existence of infinitely numerous gradations , as fine as existing varieties , con-. 31 CHAP . X. ] 73 IN ANY SINGLE FORMATION .
... distinct from other allied genera . What geological research has not revealed , is the former existence of infinitely numerous gradations , as fine as existing varieties , con-. 31 CHAP . X. ] 73 IN ANY SINGLE FORMATION .
Página 74
... former state of Europe , whilst most of our formations were accumulating . The Malay Archipelago is one of the richest regions in organic beings ; yet if all the species were to be collected which have ever lived there , how imperfectly ...
... former state of Europe , whilst most of our formations were accumulating . The Malay Archipelago is one of the richest regions in organic beings ; yet if all the species were to be collected which have ever lived there , how imperfectly ...
Página 76
... former state in a nearly uniform , though perhaps extremely slight degree , and as they would be found embedded in slightly different sub - stages of the same formation , they would , accord- ing to the principles followed by many ...
... former state in a nearly uniform , though perhaps extremely slight degree , and as they would be found embedded in slightly different sub - stages of the same formation , they would , accord- ing to the principles followed by many ...
Página 80
... former inhabitants of the world . In a I may give another instance , which , from having passed under my own eyes , has much struck me . memoir on Fossil Sessile Cirripedes , I stated that , from the large number of existing and extinct ...
... former inhabitants of the world . In a I may give another instance , which , from having passed under my own eyes , has much struck me . memoir on Fossil Sessile Cirripedes , I stated that , from the large number of existing and extinct ...
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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