THE AMINO ACIDS 147 



is connected through a 3-way tap c with a large gas burette, F, of 150 c.c. 

 capacity, the upper portion holding 40 c.c. and graduated in tenths. The gas 

 burette is connected to a Hempel pipette of special shape (Fig. 34). The 



FIG. 34. 



whole apparatus is arranged as in Fig. 34, so that \ the bulb D and Hempel 

 pipette can be fastened by a specially bent hook to a wheel driven by a 

 water or electric motor. The wheel should make 300-500 revolutions per 

 minute. 



