Hippuric Acid Deposits.
THESE deposits appear in the healthy urine of the cow and the horse; and also in that of human beings, but in such small quantities as to be scarcely appreciable.
They sometimes, however, appear in unhealthy proportions; but they never show themselves as a sediment, until after the addition sometimes alkaline, having a low specific gravity, from 1.006 to 1.008. The triple phosphates are often found in it.
To detect these deposits, fill a large watch glass with urine, and evaporate it over a lamp to a few drops. Then add to it about half its bulk of hydrochloric acid, and set it aside. The addition of the acid produces a bright pink color, and an odor like new bay. After a few hours, if the hippuric acid be present, its peculiar crystals will be seen. (Fig. 125.)
Cause. In man, this deposit is supposed to depend on the absence of food having a good share of nitrogen. The urine of vegetable eaters contains it in largest quantities.
Treatment. The only treatment required is a diet composed in good proportion of animal food, a proper attention to the skin by bathing, etc., and when debility exists, tonic medicines, as iron and bitters, with outdoor exercise enough to keep the muscles in working order.
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