Evolution by Atrophy in Biology and SociologyD. Appleton, 1899 - 316 pagini |
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Pagina 19
... importance than the others . Certain customs among criminals show a re- semblance to the habits of primitive man . On the other hand , we find cases where the individual development of an institution or society is a mere repetition of ...
... importance than the others . Certain customs among criminals show a re- semblance to the habits of primitive man . On the other hand , we find cases where the individual development of an institution or society is a mere repetition of ...
Pagina 26
... importance if it succeeds in adapting itself to the new conditions.1 1 EXAMPLES : ( a ) The leaves of the water Ranunculus with lacinated leaves ( Ranunculus aquatilis fluitans , etc. ) , are of normal structure when cultivated on dry ...
... importance if it succeeds in adapting itself to the new conditions.1 1 EXAMPLES : ( a ) The leaves of the water Ranunculus with lacinated leaves ( Ranunculus aquatilis fluitans , etc. ) , are of normal structure when cultivated on dry ...
Pagina 59
... importance , therefore , whether Archeopteryx was quadrupedal or bipedal before it took to flying , for neither of these modes of progression would have entailed the loss of two of its digits , and the disappearance may reasonably be at ...
... importance , therefore , whether Archeopteryx was quadrupedal or bipedal before it took to flying , for neither of these modes of progression would have entailed the loss of two of its digits , and the disappearance may reasonably be at ...
Pagina 71
... importance , but the leaflets , instead of de- F , bract of the involucre . 1 On examining the foliage leaves of a plant from above down- wards , one finds successively leaves with large stipules and small leaflets ( fig 38 , E ) , then ...
... importance , but the leaflets , instead of de- F , bract of the involucre . 1 On examining the foliage leaves of a plant from above down- wards , one finds successively leaves with large stipules and small leaflets ( fig 38 , E ) , then ...
Pagina 84
... importance , however , is at- tached to this last modification , as the size of the blade varies greatly in different specimens , whereas the other modifications are similar in all . ( a ) In the species already mentioned - Sagittaria ...
... importance , however , is at- tached to this last modification , as the size of the blade varies greatly in different specimens , whereas the other modifications are similar in all . ( a ) In the species already mentioned - Sagittaria ...
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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