Evolution by Atrophy in Biology and SociologyD. Appleton, 1899 - 316 pagini |
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Pagina 42
... became longer than the others , while the neigh- bouring rods began to slant , so that those nearest to the elongated rod spread out like a fan , and gradually moved outwards along the principal rod . This phenomenon was repeated ...
... became longer than the others , while the neigh- bouring rods began to slant , so that those nearest to the elongated rod spread out like a fan , and gradually moved outwards along the principal rod . This phenomenon was repeated ...
Pagina 43
... became unilateral . This pro- gressive transformation entailed the disappearance of nearly half of the fin . With creatures which have become adapted to a terrestrial life , the limbs - so far as can be judged from what is known at ...
... became unilateral . This pro- gressive transformation entailed the disappearance of nearly half of the fin . With creatures which have become adapted to a terrestrial life , the limbs - so far as can be judged from what is known at ...
Pagina 54
... became adapted to leaping . ( c ) The Tarsius ( Tarsius spectrum ) .— The tarsius , which is a small lemur , is to be found in Celebes . It is so - called owing to the remarkable length 54 UNIVERSALITY OF DEGENERATIVE EVOLUTION.
... became adapted to leaping . ( c ) The Tarsius ( Tarsius spectrum ) .— The tarsius , which is a small lemur , is to be found in Celebes . It is so - called owing to the remarkable length 54 UNIVERSALITY OF DEGENERATIVE EVOLUTION.
Pagina 58
... became so reduced that eventually only one toe remained functional . Adaptation to running was effected differently with the ruminants , but it was equally accompanied by degeneration . With them , first the great toe disappeared , then ...
... became so reduced that eventually only one toe remained functional . Adaptation to running was effected differently with the ruminants , but it was equally accompanied by degeneration . With them , first the great toe disappeared , then ...
Pagina 62
... became useless . Next , the metacarpal and the proximal phalange of the thumb became much smaller , and united with the bones of the wrist , while the distal phalange degenerated to a mere thread . Fresh evidences of degeneration ...
... became useless . Next , the metacarpal and the proximal phalange of the thumb became much smaller , and united with the bones of the wrist , while the distal phalange degenerated to a mere thread . Fresh evidences of degeneration ...
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