Evolution by Atrophy in Biology and SociologyD. Appleton, 1899 - 316 pagini |
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Pagina 32
... lost their respiratory function . The part specially adapted for that function has been allowed to atrophy , the more readily because the presence of gills on the ventral surface of the abdomen would be incompatible with free movement ...
... lost their respiratory function . The part specially adapted for that function has been allowed to atrophy , the more readily because the presence of gills on the ventral surface of the abdomen would be incompatible with free movement ...
Pagina 58
... lost first the great toe , then the fifth , and next the second and third toes became so reduced that eventually only one toe remained functional . Adaptation to running was effected differently with the ruminants , but it was equally ...
... lost first the great toe , then the fifth , and next the second and third toes became so reduced that eventually only one toe remained functional . Adaptation to running was effected differently with the ruminants , but it was equally ...
Pagina 60
... lost a phalanx ; the middle finger ( iii . ) has lost three ( degeneration No. 2 ) ; finally , the metacarpals of the index and middle fingers have fused ( a . ) thus entailing the degeneration of the muscles between those parts ...
... lost a phalanx ; the middle finger ( iii . ) has lost three ( degeneration No. 2 ) ; finally , the metacarpals of the index and middle fingers have fused ( a . ) thus entailing the degeneration of the muscles between those parts ...
Pagina 62
... lost their nails and became useless . Next , the metacarpal and the proximal phalange of the thumb became much smaller , and united with the bones of the wrist , while the distal phalange degenerated to a mere thread . Fresh evidences ...
... lost their nails and became useless . Next , the metacarpal and the proximal phalange of the thumb became much smaller , and united with the bones of the wrist , while the distal phalange degenerated to a mere thread . Fresh evidences ...
Pagina 63
... lost their nails , except- ing the thumb and the index finger in fruit - eating bats , and the thumb alone in insect - eating bats , while some of the phalanges of the digits are missing , the usual number being two instead of three ...
... lost their nails , except- ing the thumb and the index finger in fruit - eating bats , and the thumb alone in insect - eating bats , while some of the phalanges of the digits are missing , the usual number being two instead of three ...
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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