J.S. Mill's Theory of Inductive Logic

J.S. Mill's Theory of Inductive Logic

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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. 1909 edition. Excerpt: ...is great probability that in higher animals digested proteids, either in transit through the digestive epithelium or immediately upon entering the blood, are synthesized into a new proteid specifically characteristic of the animal in which it is present. Here, then, we have a degree of specificity initiated before the proteid in question has ever become cellular in nature. Of all cells in the body, those which show nuclei of enormous size in proportion to their cytoplasm arenot cells which have a large number of morphological structures to establish, but gland-cells characterized by intense secretory activity in which chiefly one kind of product is elaborated. The death of denucleated, and the regeneration of nucleated, fragments of protozoa are phenomena sometimes cited as demonstrating the fact that the nucleus is the center of morphological synthesis. But may they not indicate only that some general substance elaborated or controlled-by the nucleus is wanting? Loeb _('99) has shown that possibly in such cases failure to regenerate may be due largely to a lack of oxygen, and that the nucleus is apparently the chief source of the oxygen supply of the cell. Spitzer ('97) has established the fact, moreover, that certain "oxidation ferments" are nuclear in origin. In these experiments on protozoa the rapidity of regeneration seems to be in direct proportion to the amount of nuclear matter left in the piece---a question of quantity rather than quality. Indeed, if the nucleus is an aggregate of qualitatively different morphological units, one would expect parts to be missing in the regenerated protozoa in proportion to the amount of nuclear matter removed, but the evidence does not bearthis out. The regen-. eration is...show more

Product details

  • Paperback | 68 pages
  • 189 x 246 x 4mm | 141g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 123674103X
  • 9781236741035