. A manual of clinical diagnosis by means of microscopical and chemical methods, for students, hospital physicians, and practitioners . Plienvl-Glueosazoii Crystals obtained, from a Diabe:: : Urine CARBOHYDRATES. 441 absence of sugar, it will always be well to make a control-test withnormal urine—t. e., to prepare a similar tube with normal urinemixed with yeast, and to allow this to stand at the same a positive result is thus obtained, there ean be no doubt as to the pres-ence of a fermentable substance in the urine. This, however, is notnecessarily glucose, as other carbohydra
. A manual of clinical diagnosis by means of microscopical and chemical methods, for students, hospital physicians, and practitioners . Plienvl-Glueosazoii Crystals obtained, from a Diabe:: : Urine CARBOHYDRATES. 441 absence of sugar, it will always be well to make a control-test withnormal urine—t. e., to prepare a similar tube with normal urinemixed with yeast, and to allow this to stand at the same a positive result is thus obtained, there ean be no doubt as to the pres-ence of a fermentable substance in the urine. This, however, is notnecessarily glucose, as other carbohydrates, such as lactose, maltose, andlevulose, may likewise undergo fermentation. Still, if large amountsof gas are obtained, and if Trommers test also yields a positive result,it will be fairly safe to regard the substance present as glucose. Fig. Tri Einhorns saccharimeter. Phenylhydrazin —As originally proposed by v. Jaksch,the test is conducted as follows : 6 to 8 of urine are treatedwith to gramme of phenylhydrazin hydrochlorate and 1gramme of sodium acetate, and warmed until the salts have beendissolved, a little water being added if necessary. The tube isplaced in boiling water for twenty to thirty minutes, and thentransferred to a beaker filled with cold water. If sugar is pres-ent in moderate amounts, a bright-yellow crystalline deposit willat once be thrown down and partly adhere to the sides of the even in the presence of mere traces a careful microscopical ex-amination will reveal the presence of crystals of phenylglucosazou(Plate XVI.). These are seen singly or arranged in bundles andsheaves composed of very delicate bright-yellow needles which areinsoluble in water. 1 v. Jaksch, Zeit. f. klin. Med., 1886, vol. xi. p. 20. 442 THE UBINE. Still more convenient is the following modificatio
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