Morphology and Anthropology; A Handbook for Students

Morphology and Anthropology; A Handbook for Students

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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. 1904 edition. Excerpt: ...to the Simiidae, in the manifestation of a tendency to reduce the number from five to three. A similar remark, mutatis mutandis, as regards the number of vertebral elements concerned, applies to the sacrum. holding a place intermediate between these and the white race. The particular races mentioned are as follows: Australian and Tasmanian aborigines, Andamanese, Bushmen, and Negroes. A somewhat less elaborate analysis of the character of the lumbar curve is obtained by constructing the lumbar index in such a way that the united heights of the centra measured posteriorly (cf. Fig. 184, B), should the sum of the posterior measurements be less than that of the anterior measurements, the indication is that of a forward convexity: should the sum of the posterior measurements be in excess, the convexity forwards is replaced by a concavity: finally the sum of the posterior may equal that of the anterior measurements and the column would then be straight or vertical in this region. The modified lumbar index is thus derived from the formula _, sum of posterior measurements x 100 llKH'X =;" sum of anterior measurements' it is known as the lumbo-vertebral index, and numerically its value fluctuates between about 848 and 106 (Turner): in considering this variation, it is found that the influences of age, sex and race all take effect. As regards age, the following data are given by Ravenel and Aeby (quoted by Cunningham, " The Lumbar curve in Man and Apes." Cunningham Memoirs, II. p. 73). In the new-born infant, the height of the vertebrae is the same before as behind, the index thus being = 100, and the lumbar column straight. In the infant at 3 months of age, the anterior diameter begins to predominate, and this increase becomes more marked...show more

Product details

  • Paperback | 186 pages
  • 189 x 246 x 10mm | 340g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236617320
  • 9781236617323