The Animal Kingdom Arranged In Conformity With Its Organization Vol 13 The Classes Annelida Crustacea And Arachnida

Author : Georges Cuvier
Publisher : Forgotten Books
ISBN 13 : 9780484723022
Total Pages : 670 pages
Book Rating : 4.7/5 (23 download)

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Download or read book The Animal Kingdom, Vol. 13 written by Georges Cuvier and published by Forgotten Books. This book was released on 2017-12-25 with total page 670 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from The Animal Kingdom, Vol. 13: Arranged in Conformity With Its Organization, by the Baron Cuvier, Member of the Institute of France, &C. &C. &C., With Supplementary Additions to Each Order But the joints which compose the body have not always this sort of articulation: they are most usually united merely by flexible membranes, or emboxed one Within the other; and then their motions are more varied, but do not possess the same force. The system of organs on which the articulated animals are most similar to each other, is that of the nerves. Their brain, situated on the oesophagus, and furnishing nerves to the parts which adhere to the head, is very small. Two cords, which embrace the oesophagus, are continued' along the belly, uniting, from space to space, into double knots or ganglia, from which proceed the nerves of the body and Of the limbs. Each of these ganglia performs the functions of a brain, for the surrounding parts, and suffices to preserve their sensibility for a certain time, when the animal has been dividedf If we add to this, that the jaws of these animals, when they have any, are always lateral, and move from without to Within, and not from top to bottom, and that there has not yet been discovered in any of them a distinct organ of smell, we shall have pretty nearly expressed all that may be said of them in general. But the existence of the organs of hearing; the existence, number, and form of those of sight; the product, and the mode of generation it the nature of respiration; the existence of the organs of circulation; and even the colour of the blood, present great variations, which it will be necessary to study in the different sub-divisions. A remarkable discovery on this subject is that of M. Herold, that in the egg of the crustacea and arachnida, the vitellus communicates with the interior by the back. See his dissertation on the egg of spiders, Marburg, 1824, and that of M. Rathke on the egg of the Astaci, Leipzig, 1829. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.