. Chemistry: general, medical, and pharmaceutical, including the chemistry of the U. S. Pharmacopia. A manual on the general principles of the science, and their applications in medicine and pharmacy. th and two jagged, are generally deposited; acidulated byacetic acid, more typical forms are obtained. A drop of solutionof potash or soda placed on the glass slip will dissolve a deposit ofuric acid, a drop of any acid reprecipitating it in minute but charac-teristic crystals. Cystin is very rarely met with as an urinary deposit; that fromwhich Fig. 53 was taken was found in the urine of a patie
. Chemistry: general, medical, and pharmaceutical, including the chemistry of the U. S. Pharmacopia. A manual on the general principles of the science, and their applications in medicine and pharmacy. th and two jagged, are generally deposited; acidulated byacetic acid, more typical forms are obtained. A drop of solutionof potash or soda placed on the glass slip will dissolve a deposit ofuric acid, a drop of any acid reprecipitating it in minute but charac-teristic crystals. Cystin is very rarely met with as an urinary deposit; that fromwhich Fig. 53 was taken was found in the urine of a patient in Hospital. Lamellas of cystin always assume thehexagonal character, but the angles are sometimes ill defined andthe plates superposed: in the latter case a drop of solution ofammonia placed on the glass at once dissolves the deposit, well-marked six-sided crystals appearing as the drop dries up. Triple phosphate (magnesium and ammonium phosphate) is de- 582 MORBID URINE. posited as soon as urine becomes alkaline, the ammoniacal constit-uent being furnished by the decomposition of urea. It occurs inlarge prismatic crystals, forming a beautiful object when viewed by Fig. mm1 Cystin. Triple Phosphate. polarized light—sometimes also in ragged stellate or arborescentcrystals, resembling those of snow. Both forms may be artificiallyprepared by adding a small lump of ammonium carbonate to a few. ounces of urine and setting aside in a test-glass (Fig. 54). Amorphous deposits are either earthy phosphates (a mixture ofmagnesium and calcium phosphates) or calcium, magnesium, ammo-nium, potassium, or sodium urates—chiefly the latter. They maybe distinguished by the action of a drop of acetic acid placed nearthe sediment on the glass slip, the effect being watched under themicroscope; phosphates dissolve, while urates gradually assumecharacteristic forms of uric acid. Urates redissolve when warmedwith the supernatant urine. Sodium and magnesium urates, though g
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