Syracuse University Publication. Contributions from the Zoological Laboratory Volume 3.cSyracuse University Laboratory
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Author: Syracuse University Laboratory
Page Count: 98 pages
Published Date: 01 Mar 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
Format: Pdf
ISBN: 9781130852769
File size: 10 Mb
Download Link: Syracuse University Publication. Contributions from the Zoological Laboratory Volume 3
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 Excerpt: ... sections cut three microns and stained on the slide by the iron-haematoxylin method were made and studied in the various stages of development. Bordeaux-red made an excellent counter-stain for these sections. To supplement these, series were stained in Delafield's hematoxylin and eosin. Historical. Although the subject of metamorphism has excited the interest of naturalists of all ages, for definite work upon the problem of the internal phenomena, one need go no further back than the work of Weismann in 1864; while it was that of Metschnikoff ('83), introducing the idea of phagocytosis, that gave the incentive for closer and more thorough investigation of the subject. Weismann studied the postembryonic development of Musca vomitoria and called attention to the degeneration of the tissues of the pupa. He introduced the term "histolysis" to indicate the process of change which took place. According to him the degeneration is of a fatty nature and the resulting mass mingles with the blood whose elements have also degenerated forming altogether a thick fluid (Brei). Fragments of the mass become isolated, surround themselves with a membrane, take on a granular appearance, lose their fatty particles and acquire a nucleus. These conglomerates of detritus were termed granular spheres (Kornchenkiigeln), and to them he attributes the formation of free cells de novo, and believes they furnish material for the construction of new tissues. Ganin ('77) studied the muscidac and agrees largely with Weismann. He believes that the products of degeneration serve in the formation of new organs only as nutritive substance. He demonstrated the existence and composition of the imaginal discs, which persist as embryonic rudiments in the various organs through the growin...
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