130 
Fig. 16. 
A stopcoek, with a rectangular channel, allowed the small cup 
of about 2 e.c. capacity to be readily emptied from the large bottle 
with saturated KCl solution. 
For the daily estimation of py the apparatus, represented in Fig. 
17 has proved to be very satisfactory in the long run. The short 
perforated plunger, accurately filling up the inside of the cylinder, 
