The Doctrine of Descent and DarwinismD. Appleton and Company, 1875 - Всего страниц: 334 |
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Стр. 37
... Amphibians . The Infusoria possess many characteristics of the so - called primordial animals , but in other ways they differ from them , and point to the lowest Turbellaria . A minute animal inhabiting our seas in countless multitudes ...
... Amphibians . The Infusoria possess many characteristics of the so - called primordial animals , but in other ways they differ from them , and point to the lowest Turbellaria . A minute animal inhabiting our seas in countless multitudes ...
Стр. 41
... amphibians , is effected only by the reproduction by fission and gemmation of the elementary morphological constituents . But it lies in the nature of the process of gemmation , that it should extend far higher than fission in the scale ...
... amphibians , is effected only by the reproduction by fission and gemmation of the elementary morphological constituents . But it lies in the nature of the process of gemmation , that it should extend far higher than fission in the scale ...
Стр. 48
... not confine itself to the limits of the types ; and hence did not pause at the hypothesis that the mam- malian embryo was successively a fish , an amphibian , and in a certain sense , by a particular gradual 48 THE DOCTRINE OF DESCENT .
... not confine itself to the limits of the types ; and hence did not pause at the hypothesis that the mam- malian embryo was successively a fish , an amphibian , and in a certain sense , by a particular gradual 48 THE DOCTRINE OF DESCENT .
Стр. 73
... amphibian characters , and exhibit , for example , several important characteristics of the Batrachian skull , whereas their skin - covering recalls ' the scale - armour of the Saurians . Thus we find cha- racters combined which are ...
... amphibian characters , and exhibit , for example , several important characteristics of the Batrachian skull , whereas their skin - covering recalls ' the scale - armour of the Saurians . Thus we find cha- racters combined which are ...
Стр. 197
... amphibian and a fish . Never- theless , with some few exceptions which have a special meaning , these various echinoderms leave the egg in a larval state almost identical . The larva ( Fig . 12 ) is boat - like in form , with a curved ...
... amphibian and a fish . Never- theless , with some few exceptions which have a special meaning , these various echinoderms leave the egg in a larval state almost identical . The larva ( Fig . 12 ) is boat - like in form , with a curved ...
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Часто встречающиеся слова и выражения
according adaptation already Ammonites Amphibians animal world apes appearance Ascidian become birds body brain causes Cetacea character characteristics comparative anatomy complete connection continent Darwin dentition derivation diverge doctrine of Descent Echinoderms embryonic Eocene exhibit existence external facts families fauna fish formation fossil Gastrula gemmules genera genus geological Goethe grade gradually groups Haeckel heredity higher horse human hypothesis idea individual infer intermediate forms islands lancelet language larva larvæ likewise linguistic lower mammals Marsupials Medusa ment merely metamorphosis modifications morphological mutability natural selection naturalist observation organisms origin ovum peculiar pedigree perfect period phase phenomena placenta plants polypes possess present primordial progenitors races regard relations remains reproduction reptiles Rütimeyer says scarcely scientific separate sexual Silurian skull species strata structure systematic terrestrial animals Tertiary theory of selection tion transformation true Ungulata Ungulates varieties vertebral column Vertebrata vertebrate animals whole