The Doctrine of Descent and DarwinismD. Appleton, 1875 - 334 páginas |
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Página 7
... doctrine of the gradual and direct development of the higher and now - existing organisms from lower ancestral forms - in short , for the doctrine of the continuity of life , we must begin with a survey of the REFERENCE TO DARWIN . 7.
... doctrine of the gradual and direct development of the higher and now - existing organisms from lower ancestral forms - in short , for the doctrine of the continuity of life , we must begin with a survey of the REFERENCE TO DARWIN . 7.
Página 30
... of the Spongiada , especially in- structive as affording direct evidence of the doctrine of Descent . The organs of these animals are nearly always arranged radially round an axis , passing through the dorsal 30 THE DOCTRINE OF DESCENT .
... of the Spongiada , especially in- structive as affording direct evidence of the doctrine of Descent . The organs of these animals are nearly always arranged radially round an axis , passing through the dorsal 30 THE DOCTRINE OF DESCENT .
Página 33
... direct reverse is shown in the integuments of the Mollusca , our mussels , snails , and cuttle - fish . For although so many are supplied with protecting scales and shells , these are mere excretions from the actual skin , which remains ...
... direct reverse is shown in the integuments of the Mollusca , our mussels , snails , and cuttle - fish . For although so many are supplied with protecting scales and shells , these are mere excretions from the actual skin , which remains ...
Página 35
... direct line , nor does the elongated branch line of the latter merge , as might be imagined , into the reptiles . The birds , on their side , offer a sharp contrast to the mammals , and this separa- tion and divergence extend to all the ...
... direct line , nor does the elongated branch line of the latter merge , as might be imagined , into the reptiles . The birds , on their side , offer a sharp contrast to the mammals , and this separa- tion and divergence extend to all the ...
Página 37
... direct relationship , but in a remote cousinhood . The But we must draw attention , not to these connecting forms , which natural history assumes as perfectly self- evident , but to those which are , as it were , inconvenient to ...
... direct relationship , but in a remote cousinhood . The But we must draw attention , not to these connecting forms , which natural history assumes as perfectly self- evident , but to those which are , as it were , inconvenient to ...
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Palavras e frases frequentes
according adaptation already Ammonites Amphibians animal world apes appearance Ascidian birds body bone brain causes Cetacea character characteristics comparative anatomy complete connection continent Darwin dentition derivation diverge doctrine of Descent Echinoderms embryo 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 investigation islands lancelet language larva larvæ likewise linguistic lower mammals Marsupials Medusa ment merely metamorphosis modifications morphological mutability natural selection observations Oolite 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 theory of selection tion transformation true Ungulata Ungulates varieties vertebral column Vertebrata vertebrate animals whole