UKEAMETER. 



163 



E-30 



B C E F 



FIG. 17. Simple Urea Apparatus. 

 2. Apparatus 1 : 



Fill tube A up to the mark (5 CC ) with urine (or urea 

 solution), and place it in B. Into B place 25 cc hypo- 

 bromite solution, push the stoppers firmly into B and C; 

 the tube D will fill and water should drop into E. 

 When this flow ceases empty E, replace it so that the 

 point of D is near the bottom of E. Now tilt B 

 so that urine and reagent mix thoroughly ; the nitrogen 

 froths out and expels an equal quantity of water 

 from C. Allow B to cool four minutes, then measure 

 H 2 O in E with F = cc of nitrogen given off. Then 

 since l g urea yields 354 cc nitrogen, the quantity per 

 cent, is found thus : 



20 x cc N obtained from 5 cc urine. 



= Urea per cent. 



1 The number of ureameters which have been devised is large. The majority 

 have their gas vessels graduated in percentages of urea. The above apparatus, 

 which can be easily constructed by anyone, is sufficiently accurate when the nature 

 of the process is taken into account. 



