ie, Gs 
A. India-rubber tube leading to reservoir of /, Manometer tube. 
dry carbonic anhydride. G. Pinchcock. 
B. Receiving vessel, containing air freed fT, Pipette for measuring the carbonic an- 
from carbonic anhydride. hydride, the lower part graduated into 
C. Stop-cock, by turning which either 4 or thousandths of a c.c. above and below 
& can be made to communicate with ZH. the z c.c. mark. 
D. Board fixed vertically on a stand, to which Z. Inverted vessel of caustic potash solution, 
the gas pipette H and manometer F for ascertaining when all air had been 
are attached. displaced from the apparatus by car- 
£&. Reservoir of mercury, which can be raised benic anhydride. 
or lowered. F. Stop-cock of manometer tube. 
