Evolution by Atrophy in Biology and SociologyD. Appleton, 1899 - 316 pagini |
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Pagina 4
... PRESENT AND PAST . By T. G. BONNEY , D. Sc . , F. R. S. , F. S. A. , etc. , Professor of Geology at University College , London . $ 1.50 . 75. WHAT IS ELECTRICITY ? By JOHN TROWBRIDGE , S. D. , Rumford Pro- fessor and Lecturer on the ...
... PRESENT AND PAST . By T. G. BONNEY , D. Sc . , F. R. S. , F. S. A. , etc. , Professor of Geology at University College , London . $ 1.50 . 75. WHAT IS ELECTRICITY ? By JOHN TROWBRIDGE , S. D. , Rumford Pro- fessor and Lecturer on the ...
Pagina 30
... present researches , for reasons which we have already given . The law of universal degenerative evolution applies only to the transformations of organs , and not to their original formation in either individuals or species , under ...
... present researches , for reasons which we have already given . The law of universal degenerative evolution applies only to the transformations of organs , and not to their original formation in either individuals or species , under ...
Pagina 41
... present knowledge make it difficult to determine definitely the origin of limbs among vertebrates , but they are universally supposed to have developed from the lateral folds which still persist in Amphioxus , and which pro- bably ...
... present knowledge make it difficult to determine definitely the origin of limbs among vertebrates , but they are universally supposed to have developed from the lateral folds which still persist in Amphioxus , and which pro- bably ...
Pagina 43
... present - appear to have undergone the following transformations : The bi- pinnated fin ( such as that of Ceratodus ) ( fig . 18 ) is always the starting - point . Then the lateral rods of one half almost completely disappear ( as in ...
... present - appear to have undergone the following transformations : The bi- pinnated fin ( such as that of Ceratodus ) ( fig . 18 ) is always the starting - point . Then the lateral rods of one half almost completely disappear ( as in ...
Pagina 53
... second ( ii . ) and third ( iii . ) toes . This last stage , which represents the present and most perfect adaptation of marsupials to leaping , was attained by the predominance of the fourth toe , TRANSFORMATION OF ORGANS OF ANIMALS 53.
... second ( ii . ) and third ( iii . ) toes . This last stage , which represents the present and most perfect adaptation of marsupials to leaping , was attained by the predominance of the fourth toe , TRANSFORMATION OF ORGANS OF ANIMALS 53.
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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