Evolution by Atrophy in Biology and SociologyD. Appleton, 1899 - 316 pagini |
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Pagina 141
... ancestral organ , is attended by a functional modification of great importance . The primitive function probably discharged by the gland has given place to another and rather vague function , but one which is connected with the breaking ...
... ancestral organ , is attended by a functional modification of great importance . The primitive function probably discharged by the gland has given place to another and rather vague function , but one which is connected with the breaking ...
Pagina 179
... ancestral stages . Reduced organs may appear in two different forms . They may be atrophied after having reached a more or less complete development , and in this case we shall have to compare the course of the atrophy with the course ...
... ancestral stages . Reduced organs may appear in two different forms . They may be atrophied after having reached a more or less complete development , and in this case we shall have to compare the course of the atrophy with the course ...
Pagina 180
... ancestral stages . This is certainly the case when we compare the development of the brain of man with the probable ancestral stages as displayed in the series of verte- brates . 1 Lang , Anatomie compareé . As throughout the whole ...
... ancestral stages . This is certainly the case when we compare the development of the brain of man with the probable ancestral stages as displayed in the series of verte- brates . 1 Lang , Anatomie compareé . As throughout the whole ...
Pagina 181
... ancestral history . We have now to consider how far a reduction by atrophy or by arrest represents a retracing of steps in evolution ( fig . 61 ) . From this point of view , we may study the degeneration of the pineal eye in the slow ...
... ancestral history . We have now to consider how far a reduction by atrophy or by arrest represents a retracing of steps in evolution ( fig . 61 ) . From this point of view , we may study the degeneration of the pineal eye in the slow ...
Pagina 193
... ancestral traits to be found in a few species are naturally of a kind not to incommode their possessors . It is improbable that these are a legacy from distant ancestors ; they would not have been spared by natural selection had they ...
... ancestral traits to be found in a few species are naturally of a kind not to incommode their possessors . It is improbable that these are a legacy from distant ancestors ; they would not have been spared by natural selection had they ...
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