The Doctrine of Descent and DarwinismD. Appleton, 1897 - 335 páginas |
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Página 25
... metamorphosis of tissue , nutrition , and repro- duction taking place , indeed , but in a manner so simple and undifferentiated , that we too must attribute to these beings a neutral position betwixt plants and animals . We gain the ...
... metamorphosis of tissue , nutrition , and repro- duction taking place , indeed , but in a manner so simple and undifferentiated , that we too must attribute to these beings a neutral position betwixt plants and animals . We gain the ...
Página 55
... metamorphosis with the vague metamor- phoses of the whole animal kingdom necessarily acquired great weight , when , by Rathke's brilliant discovery , ger- minal fissures were demonstrated in the embryos of mammals and of birds , and the ...
... metamorphosis with the vague metamor- phoses of the whole animal kingdom necessarily acquired great weight , when , by Rathke's brilliant discovery , ger- minal fissures were demonstrated in the embryos of mammals and of birds , and the ...
Página 68
... metamorphosis has rendered it nearly , if not quite , impossible to recognize the true nature of the hody , pieces here and there occur with the chambering so distinctly marked , and a tubular structure peculiar to the Foraminifera ...
... metamorphosis has rendered it nearly , if not quite , impossible to recognize the true nature of the hody , pieces here and there occur with the chambering so distinctly marked , and a tubular structure peculiar to the Foraminifera ...
Página 97
... of which more instances will certainly be found now that attention has been directed to the matter . A peculiarly beautiful example is to be seen― the form here described of Oppelia Darwinii , as a METAMORPHOSIS OF AMMONITES . 97.
... of which more instances will certainly be found now that attention has been directed to the matter . A peculiarly beautiful example is to be seen― the form here described of Oppelia Darwinii , as a METAMORPHOSIS OF AMMONITES . 97.
Página 103
... metamorphosis , and the regular sequence of forms alternating with one another in heterogenesis , we shall be obliged to speak , not of individuals , but of the cycles of reproduction which comprise the various phases and series of indi ...
... metamorphosis , and the regular sequence of forms alternating with one another in heterogenesis , we shall be obliged to speak , not of individuals , but of the cycles of reproduction which comprise the various phases and series of indi ...
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Términos y frases comunes
according adaptation already Ammonites Amphibians animal world apes appearance Ascidians birds bone brain causes Cetacea character characteristics comparative anatomy complete connection continent Darwin definite dentition derivation divergent division doctrine of Descent Echinoderms embryonic Eocene exhibit existence external extremely facts families fauna favour fish formation fossil gemmules genera genus geological Goethe grade gradually groups Haeckel heredity higher horse hypothesis idea individual infer intermediate forms islands lancelet language larva larvæ likewise linguistic lower mammals Marsupials Medusa ment merely metamorphosis modifications morphological natural selection naturalist observation Oolite organisms origin Origin of Species ovum peculiar pedigree perfect period phase phenomena placenta plants polypes possess present primordial progenitors races regard relations remains reproduction reptiles resemblance Rütimeyer says scarcely separate sexual skull species strata structure systematic terrestrial animals theory of selection tion transformation Ungulata varieties vegetal vertebral column Vertebrata vertebrate animals whole