UKINE AND ITS NORMAL CONSTITUENTS. 



377 



form, of a wide-mouth bottle A ; a small test-tube B, of about 

 10 c.e. capacity ; a glass cylinder C, and a graduated bu- 

 rette D. 



Into the bottle is fitted a perforated cork, which is connected 

 by means of tubing with the burette. 5 c.c. of urine are intro- 

 duced into the test-tube and 20 c.c. of the alkaline hypobromite 

 solution into the bottle, care being taken not to bring the 



FIG. 16. 



Apparatus for the volumetric estimation of urea. 



liquids in contact with each other. The graduated burette is 

 lowered in the cylinder, until the zero mark is on a level with 

 the surface of the water in the cylinder and the connection be- 

 tween the burette and the bottle made. By now inclining the 

 bottle so that the urine comes in contact with the hypobromite, 

 decomposition of urea takes place energetically. The liberated 

 carbon dioxide is absorbed by the sodium hydrate while the 



