Summarized Proceedings and a Directory of Members Volume 1-2
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Summarized Proceedings and a Directory of Members Volume 1-2

Summarized Proceedings and a Directory of Members Volume 1-2


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About the Book

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1849 edition. Excerpt: ... Prof. Guyot, Rev. P. Lesley, Pres. Hitchcock, Prof. Hall, Dr. Jackson, and Prof. Hubbard. ' On The Embryology Of Ascidia, And The Characteristics Of New Species From The Shores Of Massachusetts. By Prof. Louis Agassiz. I Will merely give my remarks in the form of aphorisms, as it is somewhat difficult to explain such phenomena without diagrams, and as I shall have occasion to bring up again this subject when publishing my illustrations of the structure of these animals and their development from cells. In Ascidia, I have traced not only the changes which the egg undergoes, but the formation of the egg itself, and all its changes up to the time when the forming embryo had undergone all its metamorphoses and assumed its final form. The facts I have observed show distinctly that there are cells developing in the animal kingdom, in a way entirely different from the views generally entertained by physiologists about this process. Without entering into any discussion, I will stale what I have seen, and upon facts every one will be able to form his own theories as he chooses. If we place under a microscope an egg of an Ascidia, in its primitive form, we notice that it is surrounded by membranes which are transparent. The outer one is the vitelline membrane; the middle one is the germinal vesicle; and the contents are as yet perfectly transparent. In time there is a change, and instead of simply two such membranes and no granules in them, we observe the germinative dot, and granules within the outer vesicle; by and by the vitelline mass has become somewhat more condensed, and the few cells, which could be observed in it at an earlier period, have now become much more numerous. The germinative dot, which was at first a simple vesicle with...


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Product Details
  • ISBN-13: 9781235805554
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 230
  • Spine Width: 12 mm
  • Width: 189 mm
  • ISBN-10: 1235805557
  • Publisher Date: 01 Oct 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 408 gr


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