Evolution by Atrophy in Biology and SociologyD. Appleton, 1899 - 316 pagini |
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Pagina 6
... side , and from the biological side , and have now been co - ordinated and combined . This work was commenced in May 1893 , with the collaboration of our friend M. Dollo , the curator of the Natural History Museum at Brussels . In June ...
... side , and from the biological side , and have now been co - ordinated and combined . This work was commenced in May 1893 , with the collaboration of our friend M. Dollo , the curator of the Natural History Museum at Brussels . In June ...
Pagina 31
... side , the exopodite to the outer . Let us now examine the twenty metameres of the animal in succession . en ex ex pr br FIG . 2. - Diagram of typical and complete appendage of Astacus fluviatilis pr . br , gill ; ex , exopodite ; en ...
... side , the exopodite to the outer . Let us now examine the twenty metameres of the animal in succession . en ex ex pr br FIG . 2. - Diagram of typical and complete appendage of Astacus fluviatilis pr . br , gill ; ex , exopodite ; en ...
Pagina 49
... side the phalanges of the toes are : 2 , 3 , 4 , 5 , 4 in number . In passing on to the bird - footed Dinosaurians we find that with Hypsilophodon , the foot is func- tionally four - toed . From the first to the fourth toe the phalanges ...
... side the phalanges of the toes are : 2 , 3 , 4 , 5 , 4 in number . In passing on to the bird - footed Dinosaurians we find that with Hypsilophodon , the foot is func- tionally four - toed . From the first to the fourth toe the phalanges ...
Pagina 59
... side . The wing of Archaeopteryx had not therefore under- gone much modification beyond the toes of the two outer digits , but it must be remembered that the bird was a weak flyer ; instead of having a large boney sternum necessary for ...
... side . The wing of Archaeopteryx had not therefore under- gone much modification beyond the toes of the two outer digits , but it must be remembered that the bird was a weak flyer ; instead of having a large boney sternum necessary for ...
Pagina 63
... extremity of the last phalange , it becomes a small nail covering only the upper side . Another modification is exhibited at a slightly later stage . In the primitive foot of the aminota TRANSFORMATION OF ORGANS OF ANIMALS 63.
... extremity of the last phalange , it becomes a small nail covering only the upper side . Another modification is exhibited at a slightly later stage . In the primitive foot of the aminota TRANSFORMATION OF ORGANS OF ANIMALS 63.
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