154 



THE URINE. 



to a bulb. The graduations represent for each division 

 0.001 gramme of urea. That is, 0.001 gramme of urea 

 evolves enough nitrogen to fill one division. Since one 

 cubic centimeter of urine is used, weighing very nearly a 

 gramme, nitrogen to fill one division corresponds very 

 nearly to 0.1 per cent, of urea in the urine. With the tube 

 is furnished a 1-cubic-centimeter dropping pipette. 



D 



Apparatus for Determining Urea in Urine. 



An apparatus can be simply and cheaply made, after 

 the principle of SquibFs, from two 4-ounce wide-mouth 

 bottles (see figure). One of these (A) contains a vial (C), 

 which serves to hold the urine. 



Outside (7, in A, is placed the solution of sodium hy- 

 pobromite. B contains water and is connected with A by 

 a rubber tube. When the rubber stoppers are tightly in- 

 serted the urine is brought into contact with the hypo- 

 bromite by tipping A, the nitrogen of the urea being 

 liberated. This forces from B an equal volume of water. 

 The water is collected from the tube D, and when meas- 



