The Origin of Species, Том 2Books, Incorporated, 1900 - Всего страниц: 365 |
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Стр. 327
... migrated from the same region ; for during the vast geographical and climatical changes which have supervened since ancient times , almost any amount of migration is possible . But in many other cases , in which we have reason to ...
... migrated from the same region ; for during the vast geographical and climatical changes which have supervened since ancient times , almost any amount of migration is possible . But in many other cases , in which we have reason to ...
Стр. 339
... migration when the cold came on , and the re - migra- tion on the returning warmth , would generally have been due south and north . The alpine plants , for example , of Scotland , as remarked by Mr. H. C. Watson , and those of the ...
... migration when the cold came on , and the re - migra- tion on the returning warmth , would generally have been due south and north . The alpine plants , for example , of Scotland , as remarked by Mr. H. C. Watson , and those of the ...
Стр. 349
... migration cannot be in- dicated . We cannot say why certain species and not others have migrated ; why certain species have been modified and have given rise to new forms , while others have remained unaltered . We can- not hope to ...
... migration cannot be in- dicated . We cannot say why certain species and not others have migrated ; why certain species have been modified and have given rise to new forms , while others have remained unaltered . We can- not hope to ...
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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