The Origin of Species, Том 2Books, Incorporated, 1900 - Всего страниц: 365 |
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Стр. 288
... GROUPS OF ALLIED SPECIES The abrupt manner in which whole groups of species suddenly appear in certain formations , has been urged by several palæon- tologists for instance , by Agassiz , Pictet , and Sedgwick - as a fatal objection to ...
... GROUPS OF ALLIED SPECIES The abrupt manner in which whole groups of species suddenly appear in certain formations , has been urged by several palæon- tologists for instance , by Agassiz , Pictet , and Sedgwick - as a fatal objection to ...
Стр. 309
... animals can certainly be classed under existing groups , yet that at this an- cient period the groups were not so distinctly separated from each other as they now are . Some writers have objected to any extinct species , or group of species ...
... animals can certainly be classed under existing groups , yet that at this an- cient period the groups were not so distinctly separated from each other as they now are . Some writers have objected to any extinct species , or group of species ...
Стр. 320
... groups of species . He may ask where are the remains of those infinitely numerous organisms which must have existed long before the Cambrian system was deposited ? We now know that at least one animal did then exist ; but I can answer ...
... groups of species . He may ask where are the remains of those infinitely numerous organisms which must have existed long before the Cambrian system was deposited ? We now know that at least one animal did then exist ; but I can answer ...
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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