. The principles and practice of surgery. Uric Acid Calculus. Urate of Ammonia Crystals. The presence of uric acid in sediment, gravel, or a calculus, may bedetermined by treating a small portion of the substance with nitricacid and holding it over a spirit lamp until effervescence is completed 826 URINARY DEPOSITS. Pig. and it is reduced to a dry powder. When the residue thus obtainedis cool, the addition of a drop of ammonia will produce a bright violetcolor. By boiling in liquor potasses, the uric acid calculus is com-pletely dissolved. The urate of ammonia may be dissolved in the sam
. The principles and practice of surgery. Uric Acid Calculus. Urate of Ammonia Crystals. The presence of uric acid in sediment, gravel, or a calculus, may bedetermined by treating a small portion of the substance with nitricacid and holding it over a spirit lamp until effervescence is completed 826 URINARY DEPOSITS. Pig. and it is reduced to a dry powder. When the residue thus obtainedis cool, the addition of a drop of ammonia will produce a bright violetcolor. By boiling in liquor potasses, the uric acid calculus is com-pletely dissolved. The urate of ammonia may be dissolved in the samemanner, but, during the process, the presence of ammonia will be de-tected by the odor. Uric acid deposits are observed most frequently in the urine of per-sons suffering from gout or rheumatism, or from some chronic cutaneouseruption. Sediments of the urate of ammonia are most common inchildren who are imperfectly nourished, or who possess strumous con-stitutions. Oxalic Acid Diathesis.—The oxalate of lime, or mulberry calcu-lus, has in most cases an irregular tuberculated angular or spinousform; its color is usually a dark brown, and it isseldom larger than one inch in diameter. Occasion-ally it is presented in the form of small, white,smooth concretions, resembling hemp-seed; and arare variety has been described
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