The Doctrine of Descent and DarwinismD. Appleton, 1875 - 334 páginas |
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Página 9
... mammal . But the leg of a bird , as a com- plete organ does not har monize with the leg of other vertebrata until the develop- ment of the bird in the egg reveals that the disposition of the segments and of the articulations is ...
... mammal . But the leg of a bird , as a com- plete organ does not har monize with the leg of other vertebrata until the develop- ment of the bird in the egg reveals that the disposition of the segments and of the articulations is ...
Página 10
... of animals , -how , for instance , the mammal passes through stages at which the lower vertebrata remain fixed , -a connection , at first sight mysterious , is indicated between the evolution of the individual ΙΟ THE DOCTRINE OF DESCENT .
... of animals , -how , for instance , the mammal passes through stages at which the lower vertebrata remain fixed , -a connection , at first sight mysterious , is indicated between the evolution of the individual ΙΟ THE DOCTRINE OF DESCENT .
Página 34
... mammal , of one of the parasitic crustacea with a crayfish or an insect , shows , as the older zoology represented it , that in the actual forms the ground plan , or " ideal types , " find very diversified expression . A further result ...
... mammal , of one of the parasitic crustacea with a crayfish or an insect , shows , as the older zoology represented it , that in the actual forms the ground plan , or " ideal types , " find very diversified expression . A further result ...
Página 35
... mammals , and this separa- tion and divergence extend to all the subdivisions . We must figuratively represent family branches , clusters of genera , and tufts of species , which latter ramify into sub - species and varieties . With ...
... mammals , and this separa- tion and divergence extend to all the subdivisions . We must figuratively represent family branches , clusters of genera , and tufts of species , which latter ramify into sub - species and varieties . With ...
Página 37
... mammal most nearly allied to the birds , though the cause of the bird - like appearance of the lowest mammal known , is by no means to be sought in a direct relationship , but in a remote cousinhood . The But we must draw attention ...
... mammal most nearly allied to the birds , though the cause of the bird - like appearance of the lowest mammal known , is by no means to be sought in a direct relationship , but in a remote cousinhood . The But we must draw attention ...
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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