The Doctrine of Descent and DarwinismD. Appleton, 1875 - 334 páginas |
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Página 11
... phases of the development of the individual . There are here vast chasms yet to be filled up by future observa- tion , though in many points we must not altogether despair of success . But that the process of palæon- tological ...
... phases of the development of the individual . There are here vast chasms yet to be filled up by future observa- tion , though in many points we must not altogether despair of success . But that the process of palæon- tological ...
Página 29
... phase of the life . The superior energy of the existence , the functional capacity and per- fection of the bee as contrasted with the feebleness of the polype , is obviously a result , or more correctly an expression , of the greater ...
... phase of the life . The superior energy of the existence , the functional capacity and per- fection of the bee as contrasted with the feebleness of the polype , is obviously a result , or more correctly an expression , of the greater ...
Página 51
... phase . The diagram gives the section of a larva of this description , which at this period is nothing more than a stomach provided with an orifice ( fig . 5 0 ) ; its wall con- FIG . 5 . sists of two strata , or layers of cells . The ...
... phase . The diagram gives the section of a larva of this description , which at this period is nothing more than a stomach provided with an orifice ( fig . 5 0 ) ; its wall con- FIG . 5 . sists of two strata , or layers of cells . The ...
Página 52
... phase of the ciliated larva , with its twofold strata , its primitive ventral cavity and mouth , recurs in the Colenterata , with slight varia- tions in the Echinoderms , in some of the Annulosa , in the Sagitta , the Ascidians , and ...
... phase of the ciliated larva , with its twofold strata , its primitive ventral cavity and mouth , recurs in the Colenterata , with slight varia- tions in the Echinoderms , in some of the Annulosa , in the Sagitta , the Ascidians , and ...
Página 53
... phase portrayed in the diagram ( fig . 6 ) . It represents the embryo of the great black - beetle ( Hydro- philus piceus ) on its ventral side . The antennæ ( f ) , the three pair of oral appendages ( m ) , and the three pair of legs ...
... phase portrayed in the diagram ( fig . 6 ) . It represents the embryo of the great black - beetle ( Hydro- philus piceus ) on its ventral side . The antennæ ( f ) , the three pair of oral appendages ( m ) , and the three pair of legs ...
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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