Evolution by Atrophy in Biology and SociologyD. Appleton, 1899 - 316 pagini |
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Pagina xiii
... persist as rudiments 1. Absence of variation . Insignificance 、 f the rudi- mentary organ ( stipules of Tropaeolum majus , acce - sory rudiments of enamel organs in the development of teeth Chapter II . Survival of institutions • § 1 ...
... persist as rudiments 1. Absence of variation . Insignificance 、 f the rudi- mentary organ ( stipules of Tropaeolum majus , acce - sory rudiments of enamel organs in the development of teeth Chapter II . Survival of institutions • § 1 ...
Pagina 41
... persist in Amphioxus , and which pro- bably existed in the ancestors of vertebrates.1 ' A. Morphological proofs : ( a ) Lateral folds of amphioxus . ( b ) Identity of the skeletons of paired and unpaired fins . ( c ) The number of ...
... persist in Amphioxus , and which pro- bably existed in the ancestors of vertebrates.1 ' A. Morphological proofs : ( a ) Lateral folds of amphioxus . ( b ) Identity of the skeletons of paired and unpaired fins . ( c ) The number of ...
Pagina 147
... persist in a reduced condition ; in other species there are no spores , and the prothalli spring directly from the leaves ( apospory ) . 5. Phanerogams . — Some of the Phanerogams- Silene ( fig . 58 ) , Melandryum , ( fig . 59 ) ...
... persist in a reduced condition ; in other species there are no spores , and the prothalli spring directly from the leaves ( apospory ) . 5. Phanerogams . — Some of the Phanerogams- Silene ( fig . 58 ) , Melandryum , ( fig . 59 ) ...
Pagina 152
... persist , though in a modified condition , or there may remain only traces of the institution in forms , ceremonies , symbols , public games and fêtes , customs and legislative formula . In order to demonstrate this point , it will not ...
... persist , though in a modified condition , or there may remain only traces of the institution in forms , ceremonies , symbols , public games and fêtes , customs and legislative formula . In order to demonstrate this point , it will not ...
Pagina 175
... persist longest : that in fact degenerative evolution retraces the steps made by progressive evolution . Peculiarities recently acquired , if they become disused , rapidly disappear , while dispositions of a more ancient kind have a ...
... persist longest : that in fact degenerative evolution retraces the steps made by progressive evolution . Peculiarities recently acquired , if they become disused , rapidly disappear , while dispositions of a more ancient kind have a ...
Alte ediții - Afișează-le pe toate
Evolution by Atrophy in Biology and Sociology Jean Demoor,Jean Massart,Emile Vandervelde Vizualizare completă - 1899 |
Evolution by Atrophy in Biology and Sociology Jean Demoor,Jean Massart,Emile Vandervelde Vizualizare completă - 1899 |
Evolution by Atrophy in Biology and Sociology Jean Demoor,Jean Massart,Emile Vandervelde Vizualizare completă - 1899 |
Termeni și expresii frecvente
adult ancestral stages animals antheridia apical leaves appear appendages aquatic Archaeopteryx assimilative atrophy basilar leaves became become belonging bipinnated blade branches calcaneum canal cells characters chlorophyll collective property colony complete condition consists corporations Crustacea custom degeneration degenerative evolution digits disappeared embryo endopodite epipod exhibited existence exopodite female feudal floating leaves flowers foliage leaves formation formed function gland Huxley hypopod Illustrations individual instance institutions intercentrum land larval Lathyrus Aphaca leaf leaflets limbs male mammals marriage masuirs maxillipede mesonephros metatarsals modern modification muscles normal original pairs petiole phalanges pineal eye plants podite primitive Professor progressive evolution pronephros prothallus protopodite pr reduced regarded remain represent retracing Rosa rugosa rudimentary organs segment sepal slow-worm social societies sociology species stamens stem stipules stomata structure survival tarsius tendrils terminal thalamencephalon third tion traces transformation undergone useless vertebral column vertebrates vestiges wings
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