18 ROYAL SOCIETY OF CANADA 



TABLE III. 



Activity of Potassium salts of Halogen group. 



TABLE IV. 



IV. Activities of Different Potassium and Other Salts. 



After ascertaining that the activity of a selected salt was directly 

 proportional to the area exposed, and that layers having a thickness 

 of approximately 2.5 to 3 mm furnished a measure of the maximum 

 activity of the salt, a series of measurements was made on the activities 

 of a large number of potassium salts as well as on a number of others 

 of the different alkali metals. 



The results of the examination of these different salts are given 

 in Table V, and in all cases they represent the activities of layers of 

 sufficient thickness to give the maximum saturation currents. 



