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 88
... Cambrian strata , —are all undoubtedly of the most serious nature . We see this in the fact that the most eminent palæontologists , namely , Cuvier , Agassiz , Barrande , Pictet , Falconer , E. Forbes , & c . , and all our greatest ...
... Cambrian strata , —are all undoubtedly of the most serious nature . We see this in the fact that the most eminent palæontologists , namely , Cuvier , Agassiz , Barrande , Pictet , Falconer , E. Forbes , & c . , and all our greatest ...
Página 117
... Cambrian forma- tion ; for in this case , there would not have been time sufficient for the development of these organisms up to the standard which they had then reached . When advanced up to any given point , there is no necessity , on ...
... Cambrian forma- tion ; for in this case , there would not have been time sufficient for the development of these organisms up to the standard which they had then reached . When advanced up to any given point , there is no necessity , on ...
Página 121
... Cambrian strata - a discovery of which the chance is small . On the Succession of the same Types within the same Areas , during the later Tertiary periods . Mr. Clift many years ago showed that the fossil mammals from the Australian ...
... Cambrian strata - a discovery of which the chance is small . On the Succession of the same Types within the same Areas , during the later Tertiary periods . Mr. Clift many years ago showed that the fossil mammals from the Australian ...
Página 125
... Cambrian system was deposited ? We now know that at least one animal did then exist ; but I can answer this last question only by supposing that where our oceans now extend they have CHAP . XI . ] PRECEDING AND PRESENT CHAPTERS . 125.
... Cambrian system was deposited ? We now know that at least one animal did then exist ; but I can answer this last question only by supposing that where our oceans now extend they have CHAP . XI . ] PRECEDING AND PRESENT CHAPTERS . 125.
Página 126
... Cambrian system ; but that , long before that epoch , the world presented a widely different aspect ; and that the older continents formed . of formations older than any known to us , exist now only as remnants in a metamorphosed ...
... Cambrian system ; but that , long before that epoch , the world presented a widely different aspect ; and that the older continents formed . of formations older than any known to us , exist now only as remnants in a metamorphosed ...
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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