Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . to the hypobromite solution through the side open-ing of the bulbed-tube. With-draw the pipette immediatelyafter the urine has been intro-duced. When the decomposi-tion of the urea is completed(10-20 minutes) gently tapthe bulbed-tube with the fingerin order to dislodge any gas-bub-bles which may have collectedon the inner surface of the atmospheric pressure shouldnow be equalized by attach-ing the funnel-tube to thebulbed-tube at the sid
Practical physiological chemistry : a book designed for use in courses in practical physiological chemistry in schools of medicine and of science . to the hypobromite solution through the side open-ing of the bulbed-tube. With-draw the pipette immediatelyafter the urine has been intro-duced. When the decomposi-tion of the urea is completed(10-20 minutes) gently tapthe bulbed-tube with the fingerin order to dislodge any gas-bub-bles which may have collectedon the inner surface of the atmospheric pressure shouldnow be equalized by attach-ing the funnel-tube to thebulbed-tube at the side openingand introducing hypobromitesolution into it until the columnsof liquid in the two tubes areuniform in height. The gradu-ated scale of the bulbed-tubeshould now be read in orderto determine the number ofcubic centimeters of nitrogen gas evolved. By means of theappended formula the weight of the urea present in the urineunder examination may be computed. —By properly substituting in the followingformula the weight of urea, in grams, contained in the volumeof urine decomposed (1 or more) may readily be deter-mined :. 1 ??•;? llil I1 iliMiiilmili- Marshalls Urea Apparatus.(Tyson.) a, Bulbed measuring tube; b,saucer-shaped vessel; c, graduatedpipette : d, funnel-tube. 1 Ordinarily I of urine is sufficient; more may be used, however, ifits content of urea is very low. 2 = coefficient of expansion of gases for i° C. = numberof of nitrogen gas evolved from 1 gram of urea. w trim:: QUANTITATIVE ANALYSIS. 353 354-5 + 760(1 + w weight of urea, in grams. v = :observed volume of nitrogen expressed in cubic centi-meters. p = barometric pressure expressed in mm. of mercury. T= tension of aqueous vapor1 for temperature /. / temperature (centigrade). 11 we wish to calculate the percentage of urea we may do soby means of the following- proportion in which y represents thevolume of urine used and w denotes the weight of the urea co
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