Twentieth century practice; an international encyclopedia of modern medical science by leading authorities of Europe and America . this tendency to crystallize upon foreign matter that leads to the fre-quent production of uric-acid calculi. Uric-acid crystals are for themost part rhomboidal in shape, but may be rectangular, or, havingrounded extremities, they may appear ovoidal or circular. They areusually flattened, but sometimes appear to be almost perfect union of several crj^stals often produces stars and variouslyformed clusters (Figs. 52 and 53). They are the only crystals in u
Twentieth century practice; an international encyclopedia of modern medical science by leading authorities of Europe and America . this tendency to crystallize upon foreign matter that leads to the fre-quent production of uric-acid calculi. Uric-acid crystals are for themost part rhomboidal in shape, but may be rectangular, or, havingrounded extremities, they may appear ovoidal or circular. They areusually flattened, but sometimes appear to be almost perfect union of several crj^stals often produces stars and variouslyformed clusters (Figs. 52 and 53). They are the only crystals in urinewhich have a yellow color; they may vary from a dark orange orbrownish-yellow to a pale yellow, but they are never colorless. Uric-acid crystals cannot be considered abnormal in quantity, because ofspontaneous crystallization, unless this occurs within six hours afterthe urine has been voided and in unusually large quantity. Urates. The acid urates of sodium and potassium may be found in thesediment of acid urine, rarely also that of calcium. Ammoniumurate is nearly always found in alkaline urine. CHEMICAL SEDIMENTS. 755. Sodium urate is ofteuest found in the form of amorphous {gran-ules, which compose the brick-dust deposit and are very insoluble;but it sometimes occurs in the form of fan-shajaed or stellate clustersof needle-like crystals. Potassium acid urate occurs only in amor-phous form, constitutes a part of the amorphous urate deposit, andis more soluble than the sodium salt. Calcium acid urate occursrarely, in acid urine only, and in small quantity, as an amorphous,white or grayish, \evy insoluble powder. Heated to fusion, it isconverted into calcium carbonate. Ammonium urate occurs in dark-brown crystalline spheres, <^^^MhiA& €^ -J Fig. 54.—Crystals of Animonium Urate. studded with fine spiculas of various lengths, which are known as mulberry or thorn-apple crystals (Tig. 54). It occurs, as a rule,in alkaline urine and in company with amorphous calcium phos
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmedicine, bookyear1895
