Evolution by Atrophy in Biology and SociologyD. Appleton, 1899 - 316 pagini |
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Pagina 42
... became longer than the others , while the neigh- bouring rods began to slant , so that those nearest to the elongated rod spread out like a fan , and gradually moved outwards along the principal rod . This phenomenon was repeated ...
... became longer than the others , while the neigh- bouring rods began to slant , so that those nearest to the elongated rod spread out like a fan , and gradually moved outwards along the principal rod . This phenomenon was repeated ...
Pagina 43
... became unilateral . This pro- gressive transformation entailed the disappearance of nearly half of the fin . With creatures which have become adapted to a terrestrial life , the limbs - so far as can be judged from what is known at ...
... became unilateral . This pro- gressive transformation entailed the disappearance of nearly half of the fin . With creatures which have become adapted to a terrestrial life , the limbs - so far as can be judged from what is known at ...
Pagina 54
... became adapted to leaping . ( c ) The Tarsius ( Tarsius spectrum ) .— The tarsius , which is a small lemur , is to be found in Celebes . It is so - called owing to the remarkable length 54 UNIVERSALITY OF DEGENERATIVE EVOLUTION.
... became adapted to leaping . ( c ) The Tarsius ( Tarsius spectrum ) .— The tarsius , which is a small lemur , is to be found in Celebes . It is so - called owing to the remarkable length 54 UNIVERSALITY OF DEGENERATIVE EVOLUTION.
Pagina 58
... became so reduced that eventually only one toe remained functional . Adaptation to running was effected differently with the ruminants , but it was equally accompanied by degeneration . With them , first the great toe disappeared , then ...
... became so reduced that eventually only one toe remained functional . Adaptation to running was effected differently with the ruminants , but it was equally accompanied by degeneration . With them , first the great toe disappeared , then ...
Pagina 62
... 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 of degeneration ...
... 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 of 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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