. A Reference handbook of the medical sciences : embracing the entire range of scientific and practical medicine and allied science. d for its recognition. Most,if not all, of the tests that follow, are sufficiently delicateand free from fallacies for practical use ; at the sametime there are few, if any, that will not under some cir-cumstances give a false indication, either positive ornegative. This is especially true when they are calledupon to decide the presence or absence of minute tracesof dextrose. The number of test-reactions recommended for thedetection of sugar is now very great, an
. A Reference handbook of the medical sciences : embracing the entire range of scientific and practical medicine and allied science. d for its recognition. Most,if not all, of the tests that follow, are sufficiently delicateand free from fallacies for practical use ; at the sametime there are few, if any, that will not under some cir-cumstances give a false indication, either positive ornegative. This is especially true when they are calledupon to decide the presence or absence of minute tracesof dextrose. The number of test-reactions recommended for thedetection of sugar is now very great, and still reactions given below will be chiefly those that havewithstood the test of time ; any objections or possiblefallacies connected with these will be noted. Physicianswill find it to their advantage to be familiar with two ortbree tests : a rough-and-ready one that can be easily andquickly used at the bedside, and one or two others to beused as confirmatory and quantitative tests, when atleisure. Diabetic sugar may be often obtained in beautiful, well-formed crystals, by allowing a few drops of the urine to. Fig. 4271.—Crystals of Diabetic Sugar. (Beale.) evaporate spontaneously on a glass slide (Fig. 4271).(Beale.) It is very easily oxidized, , it acts as a strongreducing agent on metallic salts, etc., and it is upon thisproperty of the substance that most of the methods em-ployed for its recognition are based. So it must be re-membered that most of the tests, especially the coppertests, only detect the presence of a reducing agent, notnecessarily sugar, in abnormal quantity. Now, urine contains many reducing agents in health,and in disease they frequently increase in quantity, andmay be thus mistaken for dextrose. Among those innormal urine that will reduce copper oxide may bementioned : (a) Uric acid ; (b) creatinin ; (c) indican (?);(d) pyrocatechin (?) (alcaptonuria). Pyrocatechin is said to be the compound that was de-scribed by Bodecker under th
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectmedicine, bookyear188
