. Urinary deposits : their diagnosis, pathology, and therapeutical indications. mount of thedeposit, for if the urine is less acid than usual, it willhold dissolved much more of this salt than when ofaverage acidity. On the other hand, very acid urinewill cause a deposition of urate of ammonia when buta moderate proportion of this body is present. 133. Microscopic characters of urate of ammonia.—When a drop of urine, turbid from the presence of thissubstance, is placed between two pieces of glass, and examined with the micro-scope, a mere amorphous pre-cipitate is first seen. On mi-nute examin
. Urinary deposits : their diagnosis, pathology, and therapeutical indications. mount of thedeposit, for if the urine is less acid than usual, it willhold dissolved much more of this salt than when ofaverage acidity. On the other hand, very acid urinewill cause a deposition of urate of ammonia when buta moderate proportion of this body is present. 133. Microscopic characters of urate of ammonia.—When a drop of urine, turbid from the presence of thissubstance, is placed between two pieces of glass, and examined with the micro-scope, a mere amorphous pre-cipitate is first seen. On mi-nute examination this will befound to be composed ofmyriads of excessively mi-nute globules adhering to-gether, forming little linearmasses (Fig. 24), often mixedFiff 24 with crystals of uric acid. Sometimes, especially if theurine has been long kept, the minute particles cohereand form small opaque spherical bodies, appearingblack by transmitted light, on account of their opacity ;when examined by reflected light, on a black ground,they present a buff or fawn-colour. On the applica-. URATE OF AMMONIA. 137 tion of a slight heat to the drop of urine, the particlesof urate of ammonia disappear, again becoming visibleon cooling. An elegant mode of showing the compo-sition of the deposit, is to place a drop of the turbidurine in a watch-glass, and gently warm it; as soonas it has become clear, add a drop of almost any acid(the hydrochloric is perhaps the best), and as soon asit has become cold, examine it with the muddiness previously produced by the urate, willhave become replaced by lozenges of uric acid () The urate of ammonia occurs very rarely inspherules with crystals of uric acid adhering to theirsurface ; this is occasionally observed in albuminousurine, occurring in dropsy after scarlatina (Fig. 25),and from its opacity is best observed by reflectedlight.
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Keywords: ., bookcentury1800, bookdecade1850, booksubjecturinary, bookyear1853
