Evolution by Atrophy in Biology and SociologyD. Appleton, 1899 - 316 pagini |
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Pagina xii
... stamens ( Scrophulariacea ) § 2. Atrophy from lack of use 1. Functional inutility : ( 1 ) Etiolated plants and immobile limbs . ( 2 ) Epicotyl and primary leaf of Nymphaea . ( 3 ) Roots of Utricularia ; coty- ledons of parasitic plants ...
... stamens ( Scrophulariacea ) § 2. Atrophy from lack of use 1. Functional inutility : ( 1 ) Etiolated plants and immobile limbs . ( 2 ) Epicotyl and primary leaf of Nymphaea . ( 3 ) Roots of Utricularia ; coty- ledons of parasitic plants ...
Pagina 147
... stamens , each of which is provided with filaments and anthers in a state of degeneration . The male flowers have flowers have non - functional pistils , 1 W. Farlow , Ueber ungeschlechtliche Erzeugung von Keimpflänz- chen an ...
... stamens , each of which is provided with filaments and anthers in a state of degeneration . The male flowers have flowers have non - functional pistils , 1 W. Farlow , Ueber ungeschlechtliche Erzeugung von Keimpflänz- chen an ...
Pagina 148
... stamens ; B , hermaphrodite flower . retain only vestiges of stamens , and the pistils of the male flowers reduced to are mere filaments . In Asparagus officinalis all the transition stages between herma- phrodite and unisexual flowers ...
... stamens ; B , hermaphrodite flower . retain only vestiges of stamens , and the pistils of the male flowers reduced to are mere filaments . In Asparagus officinalis all the transition stages between herma- phrodite and unisexual flowers ...
Pagina 198
... stamen ; ec , short stamen ; o , ovary . A , very young flower with only rudi- tis ) , a cultivated variety , the ... stamens and ovary . ( The flowers A - D are seen from the side . In the figures C and D the lateral produce sepal ...
... stamen ; ec , short stamen ; o , ovary . A , very young flower with only rudi- tis ) , a cultivated variety , the ... stamens and ovary . ( The flowers A - D are seen from the side . In the figures C and D the lateral produce sepal ...
Pagina 199
... stamens ( fig . 69 , D ) , and the two shorter stamens ( fig . 69 , E ) . Moreover , the flowers display a special readiness to the suppression of certain parts such as the petals , as in the flower D ( fig . 69 ) . 3. Progressive ...
... stamens ( fig . 69 , D ) , and the two shorter stamens ( fig . 69 , E ) . Moreover , the flowers display a special readiness to the suppression of certain parts such as the petals , as in the flower D ( fig . 69 ) . 3. Progressive ...
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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