The Origin of Species, Том 2Books, Incorporated, 1900 - Всего страниц: 365 |
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Стр. 270
... intermediate forms must , on the theory , have formerly existed . I have found it difficult , when looking at any two species , to avoid picturing to myself forms directly intermediate between them . But this is a wholly false view ; we ...
... intermediate forms must , on the theory , have formerly existed . I have found it difficult , when looking at any two species , to avoid picturing to myself forms directly intermediate between them . But this is a wholly false view ; we ...
Стр. 312
... intermediate in character between those of the overlying carboniferous and under- lying Silurian systems . But each fauna is not necessarily exactly intermediate , as unequal intervals of time have elapsed between consecutive formations ...
... intermediate in character between those of the overlying carboniferous and under- lying Silurian systems . But each fauna is not necessarily exactly intermediate , as unequal intervals of time have elapsed between consecutive formations ...
Стр. 416
... intermediate varieties in the intermediate zones . For we have reason to believe that only a few species of a genus ever undergo change ; the other species becoming utterly extinct and leaving no modified progeny . Of the species which ...
... intermediate varieties in the intermediate zones . For we have reason to believe that only a few species of a genus ever undergo change ; the other species becoming utterly extinct and leaving no modified progeny . Of the species which ...
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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