ELECTRICAL CONDUCTIVITY OF AIR AND SALT VAPOURS. 4;R3 
the platinum tube a large glass tube about 4 centims. in diameter and 50 centims. 
long, tightly packed with glass wool. The resulting increase in the air pressure 
in the bulb and U-tube was counterbalanced by increasing the pressure of the air 
supply to the sprayer and the air pressure above the solution in the reservoir by 
an equal amount. 
VOL. cxcvii.—A. 
3 K 
