Evolution by Atrophy in Biology and SociologyD. Appleton, 1899 - 316 pagini |
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Pagina 30
... present researches , for reasons which we have already given . The law of universal degenerative evolution applies only to the transformations of organs , and not to their original formation in either individuals or species , under ...
... present researches , for reasons which we have already given . The law of universal degenerative evolution applies only to the transformations of organs , and not to their original formation in either individuals or species , under ...
Pagina 41
... present knowledge make it difficult to determine definitely the origin of limbs among vertebrates , but they are universally supposed to have developed from the lateral folds which still persist in Amphioxus , and which pro- bably ...
... present knowledge make it difficult to determine definitely the origin of limbs among vertebrates , but they are universally supposed to have developed from the lateral folds which still persist in Amphioxus , and which pro- bably ...
Pagina 43
... present - appear to have undergone the following transformations : The bi- pinnated fin ( such as that of Ceratodus ) ( fig . 18 ) is always the starting - point . Then the lateral rods of one half almost completely disappear ( as in ...
... present - appear to have undergone the following transformations : The bi- pinnated fin ( such as that of Ceratodus ) ( fig . 18 ) is always the starting - point . Then the lateral rods of one half almost completely disappear ( as in ...
Pagina 53
... second ( ii . ) and third ( iii . ) toes . This last stage , which represents the present and most perfect adaptation of marsupials to leaping , was attained by the predominance of the fourth toe , TRANSFORMATION OF ORGANS OF ANIMALS 53.
... second ( ii . ) and third ( iii . ) toes . This last stage , which represents the present and most perfect adaptation of marsupials to leaping , was attained by the predominance of the fourth toe , TRANSFORMATION OF ORGANS OF ANIMALS 53.
Pagina 56
... present day . Moreover , in order to promote prehension by the foot , the tibia and fibula in prehensile - footed marsupials may turn upon one another , as is the case with our radius and ulna . With the tarsius it is quite otherwise ...
... present day . Moreover , in order to promote prehension by the foot , the tibia and fibula in prehensile - footed marsupials may turn upon one another , as is the case with our radius and ulna . With the tarsius it is quite otherwise ...
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
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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