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. 1889 edition. Excerpt: ...as in the other portions of the body. cept at the joints, where they are covered with cartilage. If this fibrous membrane is removed, the bone dies. Materials of which the Bones are Made.--When a bone has been burned for a sufficient length of time it will be so brittle that it can be easily broken. If ...
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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. 1889 edition. Excerpt: ...as in the other portions of the body. cept at the joints, where they are covered with cartilage. If this fibrous membrane is removed, the bone dies. Materials of which the Bones are Made.--When a bone has been burned for a sufficient length of time it will be so brittle that it can be easily broken. If it be soaked in diluted muriatic acid it will entirely lose its stiffness, and, if of sufficient length, can be tied in a knot. By these experiments it will be seen that the bones contain a mineral or earthy substance, which makes them stiff and hard, and a certain amount of animal matter, or gelatine, which binds them together and gives them a slight degree of elasticity. The earthy substance is mostly lime, and composes about two thirds of the weight of the bone. In childhood the bones are more largely composed of animal matter than in old age. On this account, children are less likely to have their bones broken by blows and falls; but, for the same reason, they are more likely to become deformed by remaining in an improper position. The legs of young children are often bent out of shape by too much use of them before their bones are firm enough to support the weight of the body. In old persons the bones are so brittle as to break very easily, and when broken they do not readily unite again. Growth and Repair of the Bones.--The bones do not reach their full development before the age of twentyfive, and in persons who use the brain a great deal the skull is said to continue its growth much longer. The continual repair of worn-out parts is carried on in the The color of bone in the living person is a pale-rose tint, inclining in early life to red, in old age to a yellowish white. Bones assume a beautiful white when deprived of the oily...
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Add this copy of Lessons in Hygiene to cart. $14.95, fair condition, Sold by Pilkington & Sons rated 4.0 out of 5 stars, ships from Windber, PA, UNITED STATES, published 1889 by American Book Company New York.
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