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 72
... range ; and we have seen that with plants it is those which have the widest range , that oftenest present varieties ; so that , with shells and other marine animals , it is probable that those which had the widest range , far exceeding ...
... range ; and we have seen that with plants it is those which have the widest range , that oftenest present varieties ; so that , with shells and other marine animals , it is probable that those which had the widest range , far exceeding ...
Página 76
... range thousands of miles beyond its con- fines ; and analogy plainly leads to the belief that it would be chiefly these far - ranging species , though only some of them , which would oftenest produce new varie- ties ; and the varieties ...
... range thousands of miles beyond its con- fines ; and analogy plainly leads to the belief that it would be chiefly these far - ranging species , though only some of them , which would oftenest produce new varie- ties ; and the varieties ...
Página 81
... range ; the teleostean fishes might formerly have had a similarly confined range , and after having been largely developed in some one sea , have spread widely . Nor have we any right to suppose that the seas of the world have always ...
... range ; the teleostean fishes might formerly have had a similarly confined range , and after having been largely developed in some one sea , have spread widely . Nor have we any right to suppose that the seas of the world have always ...
Página 82
... range of its productions . On the sudden Appearance of Groups of allied Species in the lowest known Fossiliferous Strata . There is another and allied difficulty , which is much more serious . I allude to the manner in which species ...
... range of its productions . On the sudden Appearance of Groups of allied Species in the lowest known Fossiliferous Strata . There is another and allied difficulty , which is much more serious . I allude to the manner in which species ...
Página 131
... ranges , of great deserts and even of large rivers , we find different productions ; though as mountain - chains ... range far northward and southward in parallel lines not far from each other , under corresponding climates ; but ...
... ranges , of great deserts and even of large rivers , we find different productions ; though as mountain - chains ... range far northward and southward in parallel lines not far from each other , under corresponding climates ; but ...
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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