A manual of clinical medicine and physical diagnosis . hite), cystine, carbonate of lime (rare), blood corpus-cles (urine smoky), with matters of extraneous origin. Urine depositing Uric Acid—is very acid; of a red-dish-brown color; generally of a specific gravity above1020 ; and on cooling deposits crystals of uric acid resem-bling a yellow crystalline sand. They may be passedwith the urine. This deposit does not dissolve on theapplication of heat; but if—as often happens—the urinecontains an excess of urates, this excess will be dissolved,and hence the crystals of uric acid will become more
A manual of clinical medicine and physical diagnosis . hite), cystine, carbonate of lime (rare), blood corpus-cles (urine smoky), with matters of extraneous origin. Urine depositing Uric Acid—is very acid; of a red-dish-brown color; generally of a specific gravity above1020 ; and on cooling deposits crystals of uric acid resem-bling a yellow crystalline sand. They may be passedwith the urine. This deposit does not dissolve on theapplication of heat; but if—as often happens—the urinecontains an excess of urates, this excess will be dissolved,and hence the crystals of uric acid will become more dis-tinct. JSTitric acid dissolves the deposit, while hydro-chloric and acetic acids have no action; heated withliquor potassse, the uric-acid crystals dissolve, from theformation of urate of potass, which is readily soluble inalkaline fluid. Examined microscopically, large rhom-boidal crystals are seen ; occasionally lozenge-shaped andsquare crystals are present. The most characteristicappearance is the presence of a deposit which is made Uric acid in various forms. up of particles that look like cayenne pepper grains,but the uric acid deposit may seem to be amorphous,and it may be of lightish color. See Fig. 8. 844 EXAMINATION OF THE BLOOD, ETC. Urine containing an Excess of TJrea may be knownby its high specific gravity—1020 to 1035—and by crys-tals of nitrate of urea forming on adding nitric acid to aportion of the urine in a test-tube. If the urea be onlyslightly in excess, the urine should be concentrated, byevaporation to about one-third its bulk, before addingthe acid. Quantitative Determination of Urea (after Liebig).—It is very important that the student should know howto carry out this investigation. Urea is thrown down from its solution by mercuricnitrate (nitrate of mercury), and the precipitate so formedconsists of four equivalents of mercuric oxide (oxide ofmercury) to one equivalent of urea. On the knowledgeof this fact the process for estimati
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