594 



Mr. E. F. Burton on the Action of 



if we are to compare the efficiency of various ions in 

 discharging the colloidal particles, we must deduce numbers 

 directly proportional to the number of such ions per cubic 

 centimetre. For example, taking the above definition of 

 normality, we may look upon a 3 x 10 -6 normal solution 

 of potassium phosphate as containing the same number of 



Fi°r. 3. 



Vetocity * fO 



molecules as the number of molecules of K 6 (FeCy 6 ) 2 in a 

 3|x 10~ 6 normal solution of potassium ferricyanide. But 

 the latter solution will contain twice the number of FeCy 6 

 ions that the former contains of P0 4 ions. Consequently in 

 column 3 are written the numbers directly proportional to 

 the number of acid radical ions present per cubic centimetre; 

 of course, those numbers opposite the aluminium sulphate 

 .and the potassium ferricyanide are the only ones which will 



