An American text-book of genito-urinary diseases, syphilis and diseases of the skin . ndhernia with some obstruction of the bowel. Peritonitis, cholera, and cir-rhosis of the liver are other diseases associated with increased amounts ofindican. On finding such an increase in any specimen of urine, the diagnosticianshould be cautious in ascribing too much importance to it, for indican is oftenfound in increased amounts in the urines of nervous people suffering fromfunctional digestive disturbances. In testing for indican the reaction ofHeller gives a very easy demonstration, and is quite delica
An American text-book of genito-urinary diseases, syphilis and diseases of the skin . ndhernia with some obstruction of the bowel. Peritonitis, cholera, and cir-rhosis of the liver are other diseases associated with increased amounts ofindican. On finding such an increase in any specimen of urine, the diagnosticianshould be cautious in ascribing too much importance to it, for indican is oftenfound in increased amounts in the urines of nervous people suffering fromfunctional digestive disturbances. In testing for indican the reaction ofHeller gives a very easy demonstration, and is quite delicate enough to showsmall amounts of Three or four cubic centimeters of strong hydro-chloric acid are mixed with 30 or 40 drops of urine in a test-tube, and ifindican is present one gets a color varying from reddish-violet to an intenseblue according to the amount present. If a few drops of strong nitric acidare added, the test is still more delicate, and in the course of a few minutesone gets a violet-colored reaction. 1 See Neubauer and Vogel, 7th ed. (translated), p. Fig. 5.—Crystals of cystine (afterUltzmann). 26 URINE-ANALYSIS. Chlorides.—Chlorides are found in normal urine in considerable quan-tities, chiefly as the chloride of sodium. They are occasionally of importanceto the general practitioner from the fact that in certain acute diseases (notablyin pneumonias) they are much decreased in amount. Aside from this, theyare rarely of diagnostic importance. They may be demonstrated in an acidurine by adding to it, drop by drop, a solution of nitrate of silver, therebyprecipitating a thick white cloud of argentic chloride. Sulphates.—The sulphates normally present in urine are of littleclinical importance, and do not demand consideration in a chapter of thischaracter. Phosphates.—Phosphoric acid is present in the urine in combinationwith potassium, sodium, calcium, and magnesium in the form of phosphates of sodium and potassium (alkaline ph
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