XIX.] 



VOLUMETRIC ANALYSIS FOR UREA. 



125 



ADDITIONAL EXERCISES. 



13 Hiifner's Apparatus (fig. 65). -It consists of a stout fusiform glass 

 cylinder (B) (capacity 100 cc.), connected below by means of a glass tap with 

 a smaller tube (capacity 5 cc. ). The capacity of A is important, as it contains 

 the urine, so that it must be previously calibrated. The remainder of the 



FIG. 65. Hiifner's Urea Apparatus. 



apparatus consists of a glass bowl (C) fitted by means of a caoutchouc stopper 



upon the upper end of B. Above this is a graduated gas-collecting tube (D), 



40 cm. long and 2 cm. wide, and graduated into 0.2 cm. in units of capacity. 



By means of a long funnel fill the vessel A with urine, close the tap, and 



