On the Origin of Species by Means of Natural Selection, Or, The Preservation of Favoured Races in the Struggle for LifeAppleton, 1898 |
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Página 59
... land - shell was known belonging to either of these vast periods , with the exception of one species discovered by Sir C. Lyell and Dr. Dawson in the carboniferous strata of North America ; but now land - shells have been found in the ...
... land - shell was known belonging to either of these vast periods , with the exception of one species discovered by Sir C. Lyell and Dr. Dawson in the carboniferous strata of North America ; but now land - shells have been found in the ...
Página 60
... lands , whence the sediment was derived , accord with the belief of vast intervals of time having elapsed between each formation . We can , I think , see why the geological formations . of each region are almost invariably intermittent ...
... lands , whence the sediment was derived , accord with the belief of vast intervals of time having elapsed between each formation . We can , I think , see why the geological formations . of each region are almost invariably intermittent ...
Página 61
... land within the grinding action of the coast - waves . We may , I think , conclude that sediment must be accumulated in extremely thick , solid , or extensive masses , in order to withstand the incessant action of the waves , when first ...
... land within the grinding action of the coast - waves . We may , I think , conclude that sediment must be accumulated in extremely thick , solid , or extensive masses , in order to withstand the incessant action of the waves , when first ...
Página 64
... this class . In- land , along the whole northern bank of the Plata I saw , besides modern tertiary beds , only one small patch of slightly metamorphosed rock , which alone could have formed 64 [ CHAP . X. THE POORNESS OF OUR.
... this class . In- land , along the whole northern bank of the Plata I saw , besides modern tertiary beds , only one small patch of slightly metamorphosed rock , which alone could have formed 64 [ CHAP . X. THE POORNESS OF OUR.
Página 65
... land and of the ad- joining shoal parts of the sea will be increased , and new stations will often be formed : -all circumstances favour- able , as previously explained , for the formation of new varieties and species ; but during such ...
... land and of the ad- joining shoal parts of the sea will be increased , and new stations will often be formed : -all circumstances favour- able , as previously explained , for the formation of new varieties and species ; but during such ...
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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