On the Spontaneous lonisation of Gases. 

 Air. 



279 



Leak/pressure, mean of (5) (6) (7) = '125. 

 Hydrogen. 



Leak/pressure, mean of (1) (7) = '0225. 

 Relative leak (air = 1) =0 -184. 



Carbonic Acid. 



Leak/pressure, mean of (3) (6) = '211. 

 Kelativ leak (air 1) =1 '69. 



