Annual Announcement of Lectures

Annual Announcement of Lectures

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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. 1832 edition. Excerpt: ... phosphate of soda, 1.20. The analysis of Fourcroy and Vauquelin differs somewhat from the preceding; for, besides the ingredients already enumerated, these chemists have detected the pre sence ofa small quantity of iron and silica. The composition of the bones varies also according to the age of the individual, the state of health or disease, and the kind of bone that is examined. The gelatinous parts of bone are extracted slowly by boiling water, and the saline part is readily decomposed by some of the acids. Vital properties.--The bones, in their healthy state, possess but a small share of sensibility; they are destitute of contractility, and the slowness with which they are formed and repaired, sufliciently proves that they are endowed with but a small degree of vitality. Mode of development, and difierences according to age.--The bones, which are at first liquid like all the other parts of the body; become gradually gelatinous, and pass successively (at least the majority of them, ) into the cartilaginous and fibro-cartilaginous states, and from these into the osseous. At the commencement of embryotic life, the osseous system is merely of the consistence of mucus, and forms an uninterrupted whole, which is soon after divided into a great number of parts. Ossification begins about a month after the time of conception, and is not fully completed before the twelfth, and in some accessory parts, not until the eighteenth year of age. Ossification does not appear to result uniformly from the change of cartilage into bone. According to Howship, some parts of the osseous system, such as the bodies of the long bones a_nd the broad bones of the cranium, pass immediately from the mucous to the osseous state. The formation of bone is accompanied..
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Product details

  • Paperback | 100 pages
  • 189 x 246 x 5mm | 195g
  • United States
  • English
  • black & white illustrations
  • 1236922530
  • 9781236922533