Evolution by Atrophy in Biology and SociologyD. Appleton, 1899 - 316 pagini |
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Pagina 62
... 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 presented ...
... 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 presented ...
Pagina 85
... to raise the flowers out of the water ; R. fluitans grows in strongly - running streams , so that floating leaves would be useless . FIG . 47. - Leaf of Ouvirandra fenestralis ( after MODIFICATION OF THE ORGANS OF PLANTS 85.
... to raise the flowers out of the water ; R. fluitans grows in strongly - running streams , so that floating leaves would be useless . FIG . 47. - Leaf of Ouvirandra fenestralis ( after MODIFICATION OF THE ORGANS OF PLANTS 85.
Pagina 130
... useless , is greatly reduced , though still exhibiting signs of its original condition . 4. Mollusca . Of the group of Mollusca we will take the Gastropods and the Cephalopods as examples . There are two kinds of Gastropods , straight ...
... useless , is greatly reduced , though still exhibiting signs of its original condition . 4. Mollusca . Of the group of Mollusca we will take the Gastropods and the Cephalopods as examples . There are two kinds of Gastropods , straight ...
Pagina 134
... useless . The result may , as in Gibbium , be the total atrophy of these under wings . In the Staphylinidæ , the upper wall of the abdomen is so strong that the protection of wing covers is unnecessary ; consequently the wing covers ...
... useless . The result may , as in Gibbium , be the total atrophy of these under wings . In the Staphylinidæ , the upper wall of the abdomen is so strong that the protection of wing covers is unnecessary ; consequently the wing covers ...
Pagina 160
... are effected very quickly and useless institutions 1 Fison and Howitt , Journal of the Anthropological Institute , 1882 , p . 35 . are eliminated root and branch . It is in countries 160 UNIVERSALITY OF DEGENERATIVE EVOLUTION.
... are effected very quickly and useless institutions 1 Fison and Howitt , Journal of the Anthropological Institute , 1882 , p . 35 . are eliminated root and branch . It is in countries 160 UNIVERSALITY OF DEGENERATIVE EVOLUTION.
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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