The Origin of Species, Том 2Books, Incorporated, 1900 - Всего страниц: 365 |
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Стр. 302
... forms and the disappearance of old forms , both those naturally and those artificially produced , are bound together . In flourishing groups , the number of new specific forms which have been produced within a given time has at some ...
... forms and the disappearance of old forms , both those naturally and those artificially produced , are bound together . In flourishing groups , the number of new specific forms which have been produced within a given time has at some ...
Стр. 347
... forms returning from the south . Some , however , of the northern temperate forms would almost certainly have ascended any adjoining high land , where , if sufficiently lofty , they would have long survived like the arctic forms on ...
... forms returning from the south . Some , however , of the northern temperate forms would almost certainly have ascended any adjoining high land , where , if sufficiently lofty , they would have long survived like the arctic forms on ...
Стр. 348
... forms were the more powerful and were able to hold their places on the mountains , and afterward to migrate southward with the southern forms ; but not so the southern in regard to the northern forms . In the same manner , at the ...
... forms were the more powerful and were able to hold their places on the mountains , and afterward to migrate southward with the southern forms ; but not so the southern in regard to the northern forms . In the same manner , at the ...
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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