Evolution by Atrophy in Biology and SociologyD. Appleton, 1899 - 316 pagini |
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Pagina 32
... lost their respiratory function . The part specially adapted for that function has been allowed to atrophy , the more readily because the presence of gills on the ventral surface of the abdomen would be incompatible with free movement ...
... lost their respiratory function . The part specially adapted for that function has been allowed to atrophy , the more readily because the presence of gills on the ventral surface of the abdomen would be incompatible with free movement ...
Pagina 58
... lost first the great toe , then the fifth , and next the second and third toes became so reduced that eventually only one toe remained functional . Adaptation to running was effected differently with the ruminants , but it was equally ...
... lost first the great toe , then the fifth , and next the second and third toes became so reduced that eventually only one toe remained functional . Adaptation to running was effected differently with the ruminants , but it was equally ...
Pagina 60
... lost a phalanx ; the middle finger ( iii . ) has lost three ( degeneration No. 2 ) ; finally , the metacarpals of the index and middle fingers have fused ( a . ) thus entailing the degeneration of the muscles between those parts ...
... lost a phalanx ; the middle finger ( iii . ) has lost three ( degeneration No. 2 ) ; finally , the metacarpals of the index and middle fingers have fused ( a . ) thus entailing the degeneration of the muscles between those parts ...
Pagina 62
... lost their nails and 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 ...
... lost their nails and 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 ...
Pagina 63
... lost their nails , except- ing the thumb and the index finger in fruit - eating bats , and the thumb alone in insect - eating bats , while some of the phalanges of the digits are missing , the usual number being two instead of three ...
... lost their nails , except- ing the thumb and the index finger in fruit - eating bats , and the thumb alone in insect - eating bats , while some of the phalanges of the digits are missing , the usual number being two instead of three ...
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