. Medical diagnosis for the student and practitioner. heat S of urine to the boilingpoint. Pay no attention to any precipitate (albumin1. Add 5 of thesolution of copper sulphate used in making Fehlings solution (solution A. asdescribed . Cool partly. Add 2 of a saturated solution of sodiumacetate that has been rendered faintly acid by acetic acid. Interferingsubstances are now precipitated. Filter and add to the clear nitrate 5 the solution B used in making Fehlings solution. Boil twenty seconds. If sugar is present, the solution becomes opaque and green, and deposits,eith
. Medical diagnosis for the student and practitioner. heat S of urine to the boilingpoint. Pay no attention to any precipitate (albumin1. Add 5 of thesolution of copper sulphate used in making Fehlings solution (solution A. asdescribed . Cool partly. Add 2 of a saturated solution of sodiumacetate that has been rendered faintly acid by acetic acid. Interferingsubstances are now precipitated. Filter and add to the clear nitrate 5 the solution B used in making Fehlings solution. Boil twenty seconds. If sugar is present, the solution becomes opaque and green, and deposits,either immediately -:utes. a fine yellow precipitate. Control Positive Copper Tests.—The tests already given are pla:direct order or their convenience and rapidity, but tlie inverse order of error will seldom occur if every sugar reaction is cliecked by the one accuratetest for glucose, namely:is Coppery red istrue color. Of value innegation. A better test. Avoidoverboiling. For albumin-ous urines. Avoidance oferror. 226 MEDICAL DIAGNOSIS. ^ Quick butinaccurate. THE FERMENTATION TEST.—This test depends upon the fact thatglucose is a fermentable substance, and practically the only one that urine evercontains. The Test.—The most convenient apparatus is that of Einhorn. IfEinhorns saccharometer is not to be had, the Doremus ureometer tubes willanswer the purpose of proving sugar present or absent. Each step in the process should be checked by comparison with a normalurine, therefore, two tubes are required. Technic.—(a) Boil the two specimensfor several minutes, to drive of any airthey may contain. (b) Add to each a pinch of tartaricacid in order to maintain their acidityand prevent ammoniacal decomposition. (c) Dissolve in each the same amountof yeast (about one-sixth of a freshyeast cake is sufficient). If there beany doubt as to the freshness of theyeast, it is well to test it with a controlsolution of glucose. (d) Fill the long limb of the fermenta-tion tube o
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