University Studies Volume 7

University Studies Volume 7

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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. 1907 edition. Excerpt: ...the body, tail, and even the head increasing in length, but hardly at all in width. The tail increases in length more rapidly than the body. This change of form, although more marked in some larvae than in others, is independent of the type of larva upon which the experiment is made; robust individuals become elongate, slender ones still more so. Winter growth, however, although the easiest, is by no means the only means by which this elongation of the animal may be induced. A temperature of 150 C, provided the animals are inured to it before they have reached the size at which metamorphosis is possible, produces similar though less marked results, growth under such circumstances easily becoming too slow. Figure 4, plate II, shows such a larva, one-third of whose growth had taken place in a cistern. Again, among any large number of summer larvae, a very few will be found which are by nature very light feeders, or which have formed some special habit inconsistent with heavy feeding. These individuals always show the results of their light nutrition, frequently becoming beautifully elongated and graceful types. In nature they frequently become very large, approaching in length the limits of the species; this is because the slow growth prevents metamorphosis until complete maturity has been reached. As to the nature of this elongation it should be especially noted that these animals owe none of their slenderness to emaciation. The very contrary is true; they are unusually rounded in contour, and indeed not infrequently are excessively fat.. I was struck with this curious fact the first time that I ever had occasion to contrast an extremely massive with a slender larva. While netting 10 cm. specimens for experimental purposes, a chance stroke of my...show more

Product details

  • Paperback | 106 pages
  • 189 x 246 x 6mm | 204g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236620720
  • 9781236620729