On 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 v
... formations — On the denudation of granitic areas - On the absence of intermediate varieties in any one formation - On the sudden appearance of groups of species -On their sudden appearance in the lowest known fossiliferous strata ...
... formations — On the denudation of granitic areas - On the absence of intermediate varieties in any one formation - On the sudden appearance of groups of species -On their sudden appearance in the lowest known fossiliferous strata ...
Página 21
... formation . But he who will take the trouble to reflect on the steps by which this first degree of sterility could be increased through natural selection to that high degree which is common with so many species , and which is universal ...
... formation . But he who will take the trouble to reflect on the steps by which this first degree of sterility could be increased through natural selection to that high degree which is common with so many species , and which is universal ...
Página 48
... formations - On the denudation of granitic areas - On the absence of intermediate varieties in any one formation - On the sudden appearance of groups of species -On their sudden appearance in the lowest known fossiliferous strata ...
... formations - On the denudation of granitic areas - On the absence of intermediate varieties in any one formation - On the sudden appearance of groups of species -On their sudden appearance in the lowest known fossiliferous strata ...
Página 49
... formation and every stra- tum full of such intermediate links ? Geology assured- ly does not reveal any such finely - graduated organic chain ; and this , perhaps , is the most obvious and seri- ous objection which can be urged against ...
... formation and every stra- tum full of such intermediate links ? Geology assured- ly does not reveal any such finely - graduated organic chain ; and this , perhaps , is the most obvious and seri- ous objection which can be urged against ...
Página 52
... formations , and to mark how each author attempts to give an inadequate idea of the dura- tion of each formation , or even of each stratum . We can best gain some idea of past time by knowing the agencies at work , and learning how ...
... formations , and to mark how each author attempts to give an inadequate idea of the dura- tion of each formation , or even of each stratum . We can best gain some idea of past time by knowing the agencies at work , and learning how ...
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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