Evolution by Atrophy in Biology and SociologyD. Appleton, 1899 - 316 pagini |
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Pagina 2
... 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 non - functional pistils , 1 W. Farlow , Ueber ungeschlechtliche Erzeugung von Keimpflänz- chen an Farnprothallien . Bot ...
... stamens , each of which is provided with filaments and anthers in a state of degeneration . The male flowers have non - functional pistils , 1 W. Farlow , Ueber ungeschlechtliche Erzeugung von Keimpflänz- chen an Farnprothallien . Bot ...
Pagina 148
... stamens , and the pistils of the male flowers are reduced to filaments . FIG . 58. Flowers of Silene maritima . A , female flower with rudimentary stamens ; B , hermaphrodite flower . mere In Asparagus officinalis all the transition ...
... stamens , and the pistils of the male flowers are reduced to filaments . FIG . 58. Flowers of Silene maritima . A , female flower with rudimentary stamens ; B , hermaphrodite flower . mere In Asparagus officinalis all the transition ...
Pagina 198
... stamen ; ec , short stamen ; o , ovary . A , very young flower with only rudi- a few attain ments of two sepals ; B ... stamens and ovary . ( The flowers A - D are seen from the side . In the figures C and D the lateral and produce ...
... stamen ; ec , short stamen ; o , ovary . A , very young flower with only rudi- a few attain ments of two sepals ; B ... stamens and ovary . ( The flowers A - D are seen from the side . In the figures C and D the lateral and produce ...
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
abdominal adaptation to arboreal adult ancestral animal apical leaves appendages aquatic Archaeopteryx assimilative Astacus Astacus fluviatilis atrophy basilar leaves basipodite become biology bipinnated blade branches calcaneum cells characters chlorophyll Choanoflagellates claw collective property colony communities complete condition consists Crustacea custom degenerative evolution digits disappeared Dollo Echinoderms embryology endopodite epipod exhibited existence exopodite ex female fins five-toed floating leaves flowers foliage leaves formed function gill Heterocephalus Huxley hypopod instance institutions joint land larvæ Lathyrus Aphaca leaf leaflets limbs male mammals marriage maxillipede membrane mesonephros metameres metatarsals modification normal origin pairs petiole phalanges physiological pineal eye plants podite primitive progressive protopodite pr Ranunculus reduced regarded remain represented result rods Rosa rugosa rudimentary organs segment social societies sociology species stages stamens stem stipules stomata structure survival tarsius tendrils terrestrial thalamencephalon third tion transformation undergone useless vertebrates vestiges walking legs
Pasaje populare
Pagina 326 - XI. ANIMAL MECHANISM : a Treatise on Terrestrial and Aerial Locomotion. By Professor EJ Marey. With 117 Illustrations. Second Edition. Crown 8vo. price 5*. XII. THE DOCTRINE OF DESCENT AND DARWINISM. By Professor Oscar Schmidt. With 26 Illustrations. Fourth Edition. Crown 8vo. price 5*. XIII. THE HISTORY OF THE CONFLICT BETWEEN RELIGION AND SCIENCE. By JW Draper, MD, LL.D. Fifteenth Edition. Crown 8vo. price 5*. XIV. FUNGI: their Nature, Influences Uses, &c.
Pagina 326 - II. Physics and Politics ; or, Thoughts on the Application of the Principles of "Natural Selection " and " Inheritance
Pagina 326 - XI. Animal Mechanism : a Treatise on Terrestrial and Aerial Locomotion. By Professor EJ Marey. With 117 Illustrations. Second Edition. Crown 8vo, $s. XII. The Doctrine of Descent and Darwinism. By Professor Oscar Schmidt. With 26 Illustrations. Fifth Edition. Crown 8vo, 5*.
Pagina 82 - A plant of Drosera, with the edges of its leaves curled inwards, so as to form a temporary stomach, with the glands of the closely inflected tentacles pouring forth their acid secretion, which dissolves animal matter, afterwards to be absorbed, may be said to feed like an animal.
Pagina 326 - Edition. II. PHYSICS and POLITICS ; or, Thoughts on the Application of the Principles of ' Natural Selection ' and ' Inheritance