Studies from the Biological Laboratory (Volume 5) - Bookswagon
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Studies from the Biological Laboratory (Volume 5)

Studies from the Biological Laboratory (Volume 5)


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About the Book

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. 1893. Excerpt: ... JOHNS HOPKINS UNIVERSITY BALTIMORE STUDIES FROM THE BIOLOGICAL LABORATORY EDITED BY Professor H. N. Martin AND Professor WILLIAM K. BROOKS SALPA IN ITS RELATION TO THE EVOLUTION OF LIFE By WILLIAM K. BROOKS, PH. D. BALTIMORE THE JOHNS HOPKINS PRESS May, 1893 INTRODUCTORY NOTE (This paper consists of two chapters, VII and VIII, printed, in advance, from my memoir on the Genus Salpa, which is now passing through the press.) In chapter VI of my memoir on the Genus Salpa I shall give, at length, reasons which, briefly stated, are as follows, for believing that, while salpa is remotely descended from a pelagic, appendicularia-like ancestor, it is more immediately derived from a sessile form, similar in its habit of life, and essentially, in structure also to the ascidians. In the first place, comparative anatomy forces us to believe that the atrium of salpa is identical with the perithoracic and atrial chamber of ordinary ascidians, and the facts of embryology show beyond question that this is a real homology. Writers on the embryology of salpa and allied animals have involved the history of the atrial system in unnatural obscurity, for its origin in the salpa embryo and in the aggregated salpa is in perfect accordance with the teaching of comparative anatomy, and quite irreconcilable with any view except the one which regards these structures in salpa as strictly homologous with the median and lateral atria of ordinary ascidians. As Leuckart pointed out long ago, the atrial aperture of salpa is much nearer the mouth when it first appears than it is later, and in this respect the ontogeny of salpa exhibits evidence of an ascidian-like stage in its ancestry. The compactness of the ganglion of salpa, as contrasted with the elongated central nervous system of pri...


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Product Details
  • ISBN-13: 9781150231278
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 102
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 1150231270
  • Publisher Date: 01 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 195 gr


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