Evolution by Atrophy in Biology and SociologyD. Appleton, 1899 - 316 pagini |
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Pagina 43
... ceased to be aquatic , and that of limbs adapted to terrestrial existence . Among aquatic creatures , the Pleuracanthides and the Dipneusti ( Xenacanthus and Ceratodus ) have best preserved the bipinnated fin . In Ceratodus especially ...
... ceased to be aquatic , and that of limbs adapted to terrestrial existence . Among aquatic creatures , the Pleuracanthides and the Dipneusti ( Xenacanthus and Ceratodus ) have best preserved the bipinnated fin . In Ceratodus especially ...
Pagina 49
... ceased to be so when terrestrial life was assumed . This modification is not wholly degenerative , for the functions of the lower limbs are no less im- portant in man than in apes . There are , however , undoubted signs of degeneration ...
... ceased to be so when terrestrial life was assumed . This modification is not wholly degenerative , for the functions of the lower limbs are no less im- portant in man than in apes . There are , however , undoubted signs of degeneration ...
Pagina 51
... ceased to be arboreal in adapting itself to leaping , such as the kangaroo ; or , again , by an animal which formerly lived an arboreal life , and which con- tinued to lead such a life with the additional adaptation to leaping , such as ...
... ceased to be arboreal in adapting itself to leaping , such as the kangaroo ; or , again , by an animal which formerly lived an arboreal life , and which con- tinued to lead such a life with the additional adaptation to leaping , such as ...
Pagina 52
... ceased to be All the intervening phases of this transition from type to type are known . 1 The last segment of the leg of the jerboa - the foot being formed by the union of the second , third and fourth metatarsals -corresponds more or ...
... ceased to be All the intervening phases of this transition from type to type are known . 1 The last segment of the leg of the jerboa - the foot being formed by the union of the second , third and fourth metatarsals -corresponds more or ...
Pagina 62
... ceased to exercise any function but that of flight . There was a special pro- limb : r , radius ; c , degenerating ulna ; I , II , vision for the support of these great wings , only equalled among the development of which was ...
... ceased to exercise any function but that of flight . There was a special pro- limb : r , radius ; c , degenerating ulna ; I , II , vision for the support of these great wings , only equalled among the development of which was ...
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