Upon the Inheritance of Acquired Characters; A Hypothesis of Heredity, Development, and Assimilation
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Home > Medicine & Health Science textbooks > Medicine: general issues > Upon the Inheritance of Acquired Characters; A Hypothesis of Heredity, Development, and Assimilation
Upon the Inheritance of Acquired Characters; A Hypothesis of Heredity, Development, and Assimilation

Upon the Inheritance of Acquired Characters; A Hypothesis of Heredity, Development, and Assimilation


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About the Book

This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1911. Not illustrated. Excerpt: ... CHAPTER THREE PHENOMENA WHICH POINT TO THE EXISTENCE OF A CENTRAL ZONE OF DEVELOPMENT HYPOTHESIS OF THE STRUCTURE OF THE GERMINAL SUBSTANCE. i. Phenomena Which Point to the Existence of a Central Zone of Development The only group of organisms in which one can say that the existence of a central zone of development is directly demonstrated is that of the unicellular organisms, in which this zone is constituted by the nucleus. In pluricellular organisms it is only indirectly that we are able to arrive at the conclusion that the central zone exists. Experiment has shown that the necessary and sufficient condition for the ontogenetic development of the Infusoria is the presence of a nucleus. This latter constitutes therefore for them an effective central zone of development and consequently ontogenesis consists in them in a true and proper centroepigenesis. If one divides an amoeba or a rhizopod or an infusorian already completely developed, into many pieces, that one of these fragments which remains provided with its nucleus though it be the smallest of all, is yet capable of reproducing by new formation all the missing organs and of developing again into a normal individual; whereas the other fragments, without nuclei, are incapable of it even though they may be much larger. Especially we recall the researches upon artificial division of the Infusoria made by Nussbaum and Gruber. If, for example, one cuts a stentor into three pieces, of which each contains one portion of its moniliform nucleus, in the space of twenty-four hours each piece regenerates the missing part. The anterior extremity regenerates the posterior and vice versa; the middle piece reforms the two extremities, that is to say, both the rather complex peristomal region with its mouth, its pharynx, ...


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Product Details
  • ISBN-13: 9781150413865
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 114
  • Spine Width: 6 mm
  • Width: 189 mm
  • ISBN-10: 1150413867
  • Publisher Date: 01 Jan 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 218 gr


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Upon the Inheritance of Acquired Characters; A Hypothesis of Heredity, Development, and Assimilation
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