Evolution by Atrophy in Biology and SociologyD. Appleton, 1899 - 316 pagini |
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Pagina 31
... pair of appendages , the structure of which is based upon that of a complete ap- pendage , but in which many different adaptations have brought about the > pr conservation and increase of some of the typical parts , and the partial or ...
... pair of appendages , the structure of which is based upon that of a complete ap- pendage , but in which many different adaptations have brought about the > pr conservation and increase of some of the typical parts , and the partial or ...
Pagina 35
... pair of appendages , special degeneration accompanies special adaptive develop- ments as we have shown above . We ... pairs of maxillæ . The eight metameres of the middle of the body form the thorax , and carry on the seventh , eighth ...
... pair of appendages , special degeneration accompanies special adaptive develop- ments as we have shown above . We ... pairs of maxillæ . The eight metameres of the middle of the body form the thorax , and carry on the seventh , eighth ...
Pagina 37
... pairs of appen- dages the the exopodite shows most signs of degeneration . We will now examine the com- ponent parts of these appendages ( fig . 11 ) . The protopodite ( pr . ) consists of two parts ( ba . and co . ) , and carries a ...
... pairs of appen- dages the the exopodite shows most signs of degeneration . We will now examine the com- ponent parts of these appendages ( fig . 11 ) . The protopodite ( pr . ) consists of two parts ( ba . and co . ) , and carries a ...
Pagina 38
... pairs of walking legs there is an apparatus consisting of a fixed part — an elongation of the protopodite — and of a ... pair of walking legs , and which is enormously increased in the true claws . In this evolution degeneration is ...
... pairs of walking legs there is an apparatus consisting of a fixed part — an elongation of the protopodite — and of a ... pair of walking legs , and which is enormously increased in the true claws . In this evolution degeneration is ...
Pagina 70
... pairs of leaflets , and also a terminal leaflet — all of which are derived from the epipod . 1 In studying these types we will confine our attention to the leaves arising directly from the foliage leaves , to the exclusion of the floral ...
... pairs of leaflets , and also a terminal leaflet — all of which are derived from the epipod . 1 In studying these types we will confine our attention to the leaves arising directly from the foliage leaves , to the exclusion of the floral ...
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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