Urate of Ammonia Deposits.
THE urine which contains these deposits is generally pale, and of low specific gravity, about 1.012. It becomes opaque on cooling, from the deposition of a nearly white urate of ammonia. Instead of falling down readily, this forms ropy masses in the fluid, and looks like mucus or pus, or something between the two. Its real nature is discovered by applying a little heat, which quickly dissipates it.
Microscopic Character. Place a drop of this turbid urine between two slips of glass, and examine it closely with a microscope; you will see myriads of minute globules adhering together in linear masses. Now place a drop of the turbid urine in a watchglass, and gently warm it; as soon as it has become clear, add a drop of hydrochloric acid to it, and when it is cold, examine it with the microscope. The muddiness will be gone, and you will now see lozenges, or thick cohering prisms of uric acid (Fig. 123). The explanation of this is, that the hydrochloric acid combines with the ammonia, forming muriate of ammonia in solution, and liberating the uric acid crystals.
Urate of soda (Fig. 124) is sometimes found in urine, which has similar chemical reactions with urate of ammonia.
Causes. These deposits axe generally produced by some over. eating, or derangement of the skin. The treatment is the same as that for uric acid gravel.
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