Twentieth century practice; an international encyclopedia of modern medical science by leading authorities of Europe and America . ed for the full decomposition ofthe urea, after which the result may be read fromthe scale on the instrument. The ureometer maybe obtained with either the decimal or the Eng-lish scale, reading the fraction of a gram of urea to the cubic centi-metre of urine, or representing the number of grains in each former scale is to be preferred, however, on account of thegreater facility for calculating the percentage, gm. being equalto the normal two per cent
Twentieth century practice; an international encyclopedia of modern medical science by leading authorities of Europe and America . ed for the full decomposition ofthe urea, after which the result may be read fromthe scale on the instrument. The ureometer maybe obtained with either the decimal or the Eng-lish scale, reading the fraction of a gram of urea to the cubic centi-metre of urine, or representing the number of grains in each former scale is to be preferred, however, on account of thegreater facility for calculating the percentage, gm. being equalto the normal two per cent, of urea, Squibbs Modification.—Although this method is a modification ofthe last, it may properly be termed the hypochlorite method in con-tradistinction to it. The advantages claimed for it are that theapparatus required may readily be prepared by the physician andthat the Labarraques solution, which is used instead of the sodiumhypobromite, may be more easily obtained and is free from offensiveodor. A special apparatus may, however, be purchased. Themethod of procedure is as follows: After closing the screw clip on the. Fig. 46. —The DoremusApparatus for the Esti-mation of Urea. CHEMICAL PROPERTIES. 685 pendent rubber tube seen iu the illustration (Fig. 47) a small testtube containing 5 of the urine to be tested is placed in the smallerbottle with 25 or 30 of the test solution—Li(iuor soda) chloratse,U. S. P.; the stopj)er is tightly replaced and the screw clip is the apparatus be properly connected, only a few drops of waterwill escape from the rubber tube. A graduated glass is then placedunder the open tube and the urine is caused to mingle with the de-composing solution by tipping the bottle. Since the gas which isevolved displaces its own volume of water from the larger bottle,the quantity of the latter which is found iu the graduated glass after
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmedicine, bookyear1895
