Evolution by Atrophy in Biology and SociologyD. Appleton, 1899 - 316 pagini |
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Pagina 11
... whole forms a colony . All the cells of this colony spring then from one single cell ( a fertilized egg cell ) , and an inter- change of nutriment goes on incessantly among these cells . This is what Spencer designates as a ...
... whole forms a colony . All the cells of this colony spring then from one single cell ( a fertilized egg cell ) , and an inter- change of nutriment goes on incessantly among these cells . This is what Spencer designates as a ...
Pagina 13
... whole Echinoderm . Plainly , it would be impossible to indicate the precise point at which such an organ should be regarded as an individual . The vegetable kingdom abounds in analogous facts . A strawberry plant , for instance , gives ...
... whole Echinoderm . Plainly , it would be impossible to indicate the precise point at which such an organ should be regarded as an individual . The vegetable kingdom abounds in analogous facts . A strawberry plant , for instance , gives ...
Pagina 15
... whole , the cell exercises two totally different functions . The liver , as we now know , is a double organ consisting of a bile - forming liver , and the glycogen- producing liver , two organs which are embryologically distinct . The ...
... whole , the cell exercises two totally different functions . The liver , as we now know , is a double organ consisting of a bile - forming liver , and the glycogen- producing liver , two organs which are embryologically distinct . The ...
Pagina 17
... whole line of descent , are very deeply enrooted in the organism . They are not easily modi- fied by the influence of new environments , but maintain their likeness to one another in spite of external conditions . They are regulated by ...
... whole line of descent , are very deeply enrooted in the organism . They are not easily modi- fied by the influence of new environments , but maintain their likeness to one another in spite of external conditions . They are regulated by ...
Pagina 22
... whole , or as two aspects of the same evolution , and it will be seen that all progress must necessarily be attended by degenera- tion . CHAPTER I IN THE EVOLUTION OF ORGANS ALL MODIFICATION IS NECESSARILY ATTENDED BY DEGENERATION ...
... whole , or as two aspects of the same evolution , and it will be seen that all progress must necessarily be attended by degenera- tion . CHAPTER I IN THE EVOLUTION OF ORGANS ALL MODIFICATION IS NECESSARILY ATTENDED BY DEGENERATION ...
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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