Year Book Volume 6 download PDF, EPUB, Kindle

Year Book Volume 6. Carnegie Institution of Washington

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Author: Carnegie Institution of Washington
Number of Pages: 102 pages
Published Date: 01 May 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: Englishhttps://d20eq91zdmkqd.cloudfront.net/assets/images/book/large/9781/2311/9781231193075.jpg
ISBN: 9781231086674
File size: 15 Mb
File Name: Year.Book.Volume.6.pdf
Download Link: Year Book Volume 6
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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. 1907 Excerpt: ... comparison with the influences that these elements are known to produce on contractile tissues. The animal used in these experiments was the very hardy jelly-fish Cassiopea xatnachana, so abundant in this region. I found Cassiopea favorable material for such studies, since its circular shape and radial structure enables the observer to perform several experiments on one and the same individual, thus facilitating comparisons; for example, a ring of tissue cut from the periphery of this jelly-fish will readily begin to regenerate. Now, with such a preparation one may remove the sense-organs from half the ring, then insulate the two halves, causing one to cease pulsating while the other maintains its normal pulsations. Thus the influence of rest and activity may be observed on the regenerating surface. Many such experiments are made possible with this animal. Individuals having a number of mouth-arms removed regenerate these arms at rates which vary as much as does the rate of regeneration between the individual with one or a few removed arms and others with many arms removed. In other words, I do not find it to be always the case that the individual having the larger number of removed appendages regenerates each of these arms more rapidly than will an individual with fewer removed arms. I have not, however, up to this time, had an opportunity to make a careful study of the measurements contained in my notes, and it may possibly be that on calculating averages the results may accord more closely with those of Zeleny. Tissues removed from various parts of the disk regenerate more rapidly the nearer they are to the disk center and less rapidly as the periphery is approached. Cuts of different shapes were made in the disk, and in all of these experiments the man...

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