Evolution by Atrophy in Biology and SociologyD. Appleton, 1899 - 316 pagini |
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Pagina 13
... appears so obvious that for a long time it was regarded as a distinct species - some kind of worm . At first sight , then , the hectocotyle seems to be an individual . This , however , is not the case , as it reproduces , not a ...
... appears so obvious that for a long time it was regarded as a distinct species - some kind of worm . At first sight , then , the hectocotyle seems to be an individual . This , however , is not the case , as it reproduces , not a ...
Pagina 22
... appear as the two sides of one whole , or as two aspects of the same evolution , and it will be seen that all progress must necessarily be attended by degenera- tion . CHAPTER I IN THE EVOLUTION OF ORGANS ALL MODIFICATION IS NECESSARILY ...
... appear as the two sides of one whole , or as two aspects of the same evolution , and it will be seen that all progress must necessarily be attended by degenera- tion . CHAPTER I IN THE EVOLUTION OF ORGANS ALL MODIFICATION IS NECESSARILY ...
Pagina 43
... 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 ...
... 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 67
... appear- ance ( rs . ) . The phalanges are very well developed ( phal . ) , but , on the other hand , the distal phalanges ( ph . ) have degenerated and are very short . Heterocephalus ( fig . 36 ) is a burrowing rodent , only , instead ...
... appear- ance ( rs . ) . The phalanges are very well developed ( phal . ) , but , on the other hand , the distal phalanges ( ph . ) have degenerated and are very short . Heterocephalus ( fig . 36 ) is a burrowing rodent , only , instead ...
Pagina 72
... appears altogether ( fig . 38 , H and 1 ) . The apical leaves , like the basilar leaves , are eventually simply to the hypopod . reduced 2. Serratula cen- tauroides . The foli- age leaves of this species are close to the ground , their ...
... appears altogether ( fig . 38 , H and 1 ) . The apical leaves , like the basilar leaves , are eventually simply to the hypopod . reduced 2. Serratula cen- tauroides . The foli- age leaves of this species are close to the ground , their ...
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