Evolution by Atrophy in Biology and SociologyD. Appleton, 1899 - 316 pagini |
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Pagina 23
... . Development of organs in the individual . - In the course of embryological development , organs do not exactly repeat the successive phases A B C D through which they passed during their EVOLUTION AND DEGENERATION OF ORGANS 23.
... . Development of organs in the individual . - In the course of embryological development , organs do not exactly repeat the successive phases A B C D through which they passed during their EVOLUTION AND DEGENERATION OF ORGANS 23.
Pagina 24
... successively through stages corresponding to those which are to be found in the adult fish , frog , bird , and mammal . In this case the development consists in an increasing com- plexity of the 24 UNIVERSALITY OF DEGENERATIVE EVOLUTION.
... successively through stages corresponding to those which are to be found in the adult fish , frog , bird , and mammal . In this case the development consists in an increasing com- plexity of the 24 UNIVERSALITY OF DEGENERATIVE EVOLUTION.
Pagina 29
... successive generations of different cells , thus generating other kinds of organs than those to which they would have given birth under normal conditions . This happens , for instance , with all the cells of Salix , which are capable of ...
... successive generations of different cells , thus generating other kinds of organs than those to which they would have given birth under normal conditions . This happens , for instance , with all the cells of Salix , which are capable of ...
Pagina 70
... successive basilar leaves ; F , foliage leaf ; G - 1 , successive apical leaves . lateral stipules which arise from the hypopod and are fused with the base of the petiole . The petiole , which arises from the mesopod , has from two to ...
... successive basilar leaves ; F , foliage leaf ; G - 1 , successive apical leaves . lateral stipules which arise from the hypopod and are fused with the base of the petiole . The petiole , which arises from the mesopod , has from two to ...
Pagina 71
... successive apical leaves ; the floral buds . This modification FIG . 39. — Leaves from the is effected differently ... successively leaves with large stipules and small leaflets ( fig 38 , E ) , then leaves with very small leaflets ...
... successive apical leaves ; the floral buds . This modification FIG . 39. — Leaves from the is effected differently ... successively leaves with large stipules and small leaflets ( fig 38 , E ) , then leaves with very small leaflets ...
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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