48 



-0,211 

 -0,215 

 -0218 

 -0.221 

 1225 

 1228 

 ).231 



Fig. 11. 

 Huhemann's 

 Uricometer. 



Fill up so that the base of the upper arch 

 of the double meniscus is on a level with mark 

 J as shown in the illustration. 



Then add the urine to be examined, which 

 has to be at a temperature of 18° Centigrade, 

 to the mark 2.45 (2.6 ecm). 



Close the tube with glass stopper and 

 shake well when the carbon bisulphide will be- 

 come a dark copper brown color. 



After adding more urine under continued 

 strong shaking, the carbon bisulphide will ab- 

 sorb all free iodine and the mixture will look 

 like urine. 



Slowly adding more urine will change the 

 yellow foam, created by the shaking, into 

 white foam. 



The color of the carbon bisulphide will 

 turn pink after a while. 



Should this color remain the same after 

 the apparatus has been shaken repeatedly and 

 turned upside down, add another drop of 

 urine and keep up the same procedure until 

 only a slightly reddish coloration of the car- 

 bon bisulphide remains. 



Now shake again vigorously and the car- 

 bon bisulphide will turn porcelain white and 

 the urine will look like cloudy whey. 



To recapitulate: — The adding of urine 

 has to be stopped as soon as the carbon bi- 

 sulphide shows only a slightly reddish tint, 

 because this will disappear entirely after re- 

 peated shakings. The test is finished when the 

 indicator appears snow-white, a $ign that all 

 iodine has been neutralized hy the urine. 



To get rid of the remaining foam move 

 the tube a few times slowly to a horizontal 

 position, then open the stopper a little, to al- 

 low all liquid to settle in the tube. 



The proportion of uric acid is then read 

 off the upper 'scale (per thousand of urine). 



The percentage is obtained by putting 



