Examination of the urine; a manual for students and practitioners . e to fifteenhours. The larger tubeis opened and the con-tents stirred to liberatethe C02. The floccu-lent mass is allowed tosettle and the cap isreplaced. Then the spe-cific gravity of the urinein both tubes is readfrom the flat tops of themetal caps. Each degreeof specific .gravity lostequals gm. of glu- Fig. 13.—Sterns urinoglucosometer. COSe per IOO CC. of urine. The difference in specificgravity between the urines in the two tubes, multiplied , is the percentage of sugar present. The methodis convenient and,
Examination of the urine; a manual for students and practitioners . e to fifteenhours. The larger tubeis opened and the con-tents stirred to liberatethe C02. The floccu-lent mass is allowed tosettle and the cap isreplaced. Then the spe-cific gravity of the urinein both tubes is readfrom the flat tops of themetal caps. Each degreeof specific .gravity lostequals gm. of glu- Fig. 13.—Sterns urinoglucosometer. COSe per IOO CC. of urine. The difference in specificgravity between the urines in the two tubes, multiplied , is the percentage of sugar present. The methodis convenient and, though open to the objections of in-accuracy which obtain in all fermentation tests, is suffi-ciently exact for clinical purposes. Schiitzs Method.—An instrument devised by J. Schutzis styled an areosaccharomeier, and its construction isbased upon the difference in the density of urine beforeand after fermentation. The instrument consists of a ves-sel which is filled with urine and immersed in water, thelong neck of the instrument being so graduated that the. QUANTITATIVE DETERMINATION OF SUGAR 119 divisions indicate the percentage of sugar correspondingto the difference in density before and after vessel is filled with urine to the proper mark and igm. of compressed yeast is added. Enough shot is put into allow the vessel to sink to o. The contents are shaken welland are allowed to ferment at room-temperature for fromtwenty-four to thirty-six hours. The instrument is thenimmersed in water and the specific gravity and the per-centage of sugar read. This method is said to be moreaccurate than Einhorns, but the latter is more convenientfor every-day work. Polarization.—The polariscope offers the most accurateand quickest method of determining the amount of glucosewhen the quantity exceeds i per cent. The best instru-ments in the hands of experts can detect smaller amounts( per cent.), but, unfortunately, the apparatus is socostly that it is out of the
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