Items of Interest Volume 28

Items of Interest Volume 28

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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. 1906 edition. Excerpt: ...through primary variation of the germ-plasma and appeared for the first time in the offspring, is acquired indirectly and can also be transmitted hereditarily. "That which produces a secondary but adequate variation in the germ-plasma after having appeared first in the soma (body) of the same generation is acquired and hereditarily transmissible. "Acquired conditions of the soma which do not produce an adequate variation in the germ-plasma cannot possibly be transmitted. This seems to apply to all mutilations of external and superficial parts." Weismann, especially, expresses a most serious doubt as to the possibility of the transmission of acquired characters because of the necessity of recording these characters in the germ-plasma. The same author ascribes the apparent transmission of acquired diseases rather to an infection of the germ-plasma than to any change within the germ-plasma. While we have under consideration the transmission of characters of the teeth acquired by an animal during its life time I wish to submit the following argument of Tomes: --"But even if we grant the one much disputed point, namely, that characters acquired by the individual during its own life time can be transmitted to its offspring, there is a special difficulty remaining in the case of the teeth in adopting the simple mechanical explanation that the teeth are, so to speak, Relation of fieredity to tooth Torms. drawn out of their forms, whether in one or in ten thousand generations. For, unlike the bone, which is constantly growing and being renewed after it has come into use, that portion of the tooth which is subject to these direct influences is hard and rigid, and its form, whatever it be, in that individual is unalterable; in...
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Product details

  • Paperback | 350 pages
  • 189 x 246 x 19mm | 626g
  • United States
  • English
  • black & white illustrations
  • 1236764854
  • 9781236764850