Evolution by Atrophy in Biology and SociologyD. Appleton, 1899 - 316 pagini |
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Pagina xii
... Roots of Utricularia ; coty- ledons of parasitic plants ( Cuscuta , Orobanche ) ; leaves transformed to spines in Phyllocactus crenatus . ( 4 ) Atrophy of the branchial arches in mammals . ( 5 ) Atrophy of ventral fins ( Pediculati ...
... Roots of Utricularia ; coty- ledons of parasitic plants ( Cuscuta , Orobanche ) ; leaves transformed to spines in Phyllocactus crenatus . ( 4 ) Atrophy of the branchial arches in mammals . ( 5 ) Atrophy of ventral fins ( Pediculati ...
Pagina 67
... roots of the hair that degeneration is manifested . One form of hair , however , is still to be found on Heterocephalus , for there are a few bristles on the outer sides of the feet . These serve as brushes to sweep away the sand while ...
... roots of the hair that degeneration is manifested . One form of hair , however , is still to be found on Heterocephalus , for there are a few bristles on the outer sides of the feet . These serve as brushes to sweep away the sand while ...
Pagina 79
... roots , the latter being the most rare . We will confine our atten- tion at present to those adapted from leaves . In Cobaea scandens the first two leaves of the seedling usually terminate in a leaflet ( fig . 43 , A ) ; the leaves ...
... roots , the latter being the most rare . We will confine our atten- tion at present to those adapted from leaves . In Cobaea scandens the first two leaves of the seedling usually terminate in a leaflet ( fig . 43 , A ) ; the leaves ...
Pagina 84
... roots , has greatly diminished in size owing to the diminution of transpiration . 3. Very little light penetrates to submerged leaves , and oxygen is only partially soluble in water . The blade has therefore become much smaller . Very ...
... roots , has greatly diminished in size owing to the diminution of transpiration . 3. Very little light penetrates to submerged leaves , and oxygen is only partially soluble in water . The blade has therefore become much smaller . Very ...
Pagina 88
... roots or the stems and occasionally in the leaves . Where the leaves are fleshy , these reservoir leaves are gener- ally very simple in forma- FIG . 49. - Growing point of Semper- tion . Those of Sempervi- vivum arachnoideum . vum and ...
... roots or the stems and occasionally in the leaves . Where the leaves are fleshy , these reservoir leaves are gener- ally very simple in forma- FIG . 49. - Growing point of Semper- tion . Those of Sempervi- vivum arachnoideum . vum and ...
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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