. A Reference handbook of the medical sciences : embracing the entire range of scientific and practical medicine and allied science. isamorphous. Acid potassium and calcium urates areamorphous, and occur under similar con-ditions to the sodium salt; the former iscomparatively soluble in water, the cal-cium salt is very insoluble. Calciumurate leaves after ignition a residue ofcalcium carbonate. Acid ammonium urate is the onlyurate that occurs in alkaline urine; itcrystallizes in smooth spherules, thorn-apple crystals, which appear quite darkby transmitted light, or occasionally inshort bone-li
. A Reference handbook of the medical sciences : embracing the entire range of scientific and practical medicine and allied science. isamorphous. Acid potassium and calcium urates areamorphous, and occur under similar con-ditions to the sodium salt; the former iscomparatively soluble in water, the cal-cium salt is very insoluble. Calciumurate leaves after ignition a residue ofcalcium carbonate. Acid ammonium urate is the onlyurate that occurs in alkaline urine; itcrystallizes in smooth spherules, thorn-apple crystals, which appear quite darkby transmitted light, or occasionally inshort bone-like, or dumb-bell crystalslying singly or in crosses. The crystalswith long curved spines (Fig. 4279) oc-curring in neutral or ammoniacal urine,are very characteristic. These are, bysome authors, wrongly called sodiumurates. The occurrence of this sedimenthas no- special significance, it is merelyan incident in ammoniacal fermentationof urine. Urine that contains cystin is usuallypale and the deposit is gray or dirty yel-low, and largely composed of microscopic hexagonalplates often overlapping (Fig. 4280). In acid urine, cys-. 4280.—1. Cystin. 3. Gonorrhoea! Thread. 3. Spermatozoa. tin is usually accompanied by oxalate of lime ; in alka-line urine by an abundance of triple phosphates and cal- 437 REFERENCE HANDBOOK OF THE MEDICAL SCIENCES. cium phosphate ; when decomposing, this urine alwaysevolves sulphuretted hydrogen gas. Cystinuria is usu-ally an hereditary disorder. (See Cystin.) Tyrosiu precipitates are sometimes accompanied bythe spheres of leucin (Fig. 4276), but, usually, the latterare not deposited unless the urine is concentrated. (SeeLeucin and T3rosin.) Fat is a very rare precipitate, except in chyluria. If
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectmedicine, bookyear188
