The Origin of Species, Том 2Books, Incorporated, 1900 - Всего страниц: 365 |
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Стр. 307
... regions have not been deposited during the same exact pe- riods — a formation in one region often corresponding with a blank interval in the other - and if in both regions the species have gone on slowly changing during the accumulation ...
... regions have not been deposited during the same exact pe- riods — a formation in one region often corresponding with a blank interval in the other - and if in both regions the species have gone on slowly changing during the accumulation ...
Стр. 329
... regions ; and secondly ( in the following chapter ) , the wide distribution of fresh - water productions ; and ... region are different from those of another region , though closely allied to them , it can be shown that migration ...
... regions ; and secondly ( in the following chapter ) , the wide distribution of fresh - water productions ; and ... region are different from those of another region , though closely allied to them , it can be shown that migration ...
Стр. 338
... regions . The latter , at the same time , would travel farther and farther southward , unless they were stopped by barriers , in which case they would perish . The mountains would become covered with snow and ice , and their former ...
... regions . The latter , at the same time , would travel farther and farther southward , unless they were stopped by barriers , in which case they would perish . The mountains would become covered with snow and ice , and their former ...
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adapted admit affinity ancient animals appear Archipelago areas become believe belonging birds Cambrian characters classification climate closely allied species common continent creation crustaceans degree deposits descent with modification developed difficulty distant distinct species domestic doubt embryo Europe existing extinct facts faunas 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 INDIANENSIS individuals inhabitants inherited insects instance intermediate intervals land larvæ less living mammæ mammals manner marine Marsupials MDCCCXX migration modified descendants mongrels mountains natural selection naturalists nearly oceanic islands offspring parent peculiar perfect pistil plants pollen present probably produced progenitor quadrupeds reciprocal crosses regions remains remarked reproductive resemblance rocks rudimentary organs seeds SIGILLUM Silurian South America stage stamens sterility structure successive suppose terrestrial tertiary theory of natural tion variations varieties VERITAS whole widely different