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The Early Development of Amblystoma; With Observations on Some Other Vertebrates: With Observations on Some Other Vertebrates(English)

The Early Development of Amblystoma; With Observations on Some Other Vertebrates: With Observations on Some Other Vertebrates(English)

          
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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. 1895. Excerpt: ... that from eggs manifesting such diversities of cleavage identical embryos, so far as we are able to determine, arise. If abnormal embryos resulted, the variations from a given type might bear a direct causal relation; but from the evidence bearing upon this point such does not appear to be the case, and my study only emphasizes the truth of the statement made by Jordan and myself ( 91) that "the irregularities of cleavage have no appreciable effect upon any stage of development of the embryo." The above being true, two alternatives present themselves. Either the egg is isotropic, or its mosaic character is not revealed by its mode of cleavage. If the former be true, we are wholly unable to explain the many facts of precocious differentiation so obvious in the Annelids, Molluscs, and other invertebrates. To accept the latter is to admit the inadequacy of the mosaic theory as based upon cleavage phenomena. II. Gastrulation To Closure Of Neural Folds. 1. Formation And Closure Of The Blastopore In Amblystoma. About 60 hrs. after the first cleavage gastrulation begins. In order to follow the process in detail the following methods were employed: The egg, while still within its membranes, was placed upon a glass slide, and after allowing the membranes to dry just enough to hold the egg firmly in situ, the slide was inverted and placed over a moist chamber. This method together with the assistance of a bed of cotton upon which the eggs, with envelopes removed, could be easily held in position, have enabled me to observe the movement of individual cells. At the close of cleavage there is an irregular broken line (bp., Pl. XX, Fig. 1) lying just below the equator and formed by the union of a number of cleavage furrows; along this line the process first begins. Whi...


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Product Details
  • ISBN-13: 9781154440867
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 18
  • Series Title: English
  • Sub Title: With Observations on Some Other Vertebrates
  • Width: 189 mm
  • ISBN-10: 1154440869
  • Publisher Date: 05 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 1 mm
  • Weight: 54 gr


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