Evolution by Atrophy in Biology and SociologyD. Appleton, 1899 - 316 pagini |
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Pagina 47
... further , and is accompanied by phenomena of degeneration in other parts of the limb . While , in the case of the Gorilla ( fig . 21 ) the great toe has a true articulation between the metatarsal and the first phalanx , and also between ...
... further , and is accompanied by phenomena of degeneration in other parts of the limb . While , in the case of the Gorilla ( fig . 21 ) the great toe has a true articulation between the metatarsal and the first phalanx , and also between ...
Pagina 56
... further evidence of degeneration in the upper half of the fibula which has become reduced to a mere thread . There is no question that these phenomena are the result of adaptation to leaping , for they are not exhibited among ...
... further evidence of degeneration in the upper half of the fibula which has become reduced to a mere thread . There is no question that these phenomena are the result of adaptation to leaping , for they are not exhibited among ...
Pagina 60
... further signs of degeneration . In the fowl ( fig . 29 ) all the claws have disappeared ( degeneration No. 1 ) ; the thumb ( i . ) and the index finger ( ii ) have each lost a phalanx ; the middle finger ( iii . ) has lost three ...
... further signs of degeneration . In the fowl ( fig . 29 ) all the claws have disappeared ( degeneration No. 1 ) ; the thumb ( i . ) and the index finger ( ii ) have each lost a phalanx ; the middle finger ( iii . ) has lost three ...
Pagina 63
... Further , instead of the ulna and radius being equally developed in the fore - arm , the ulna is greatly reduced in size . 5. Adaptation to arboreal life . — We have seen that , as a rule , the first evidence of adaptation to arboreal ...
... Further , instead of the ulna and radius being equally developed in the fore - arm , the ulna is greatly reduced in size . 5. Adaptation to arboreal life . — We have seen that , as a rule , the first evidence of adaptation to arboreal ...
Pagina 64
... further promote this opposability , there is a fusion of digits ( syndactilism ) , i.e. each set of digits is enclosed up to the nails within a common integument . The result of this is that the enclosed digits are no longer capable of ...
... further promote this opposability , there is a fusion of digits ( syndactilism ) , i.e. each set of digits is enclosed up to the nails within a common integument . The result of this is that the enclosed digits are no longer capable of ...
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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