TO THEIR STATE OF IONIZAT1ON MACGREGOR. 245 



THE DETERMINATION OF THE IONIZATION-CONSTANTS FOR THE 



FREE IONS. 



The values of the constants l a , l b , I , etc., may probably, in 

 some cases at least, be determinable in the following way : 

 The experiments just referred to would give l a + l , l b + l , etc., 

 as well as k ap and k bp , etc. If now, guessing at the value of I , 

 we find the first three terms of (12) to be negligible at dilutions 

 at which P ab and P bp can be determined with sufficient accuracy, 

 determination of these quantities will give the value of la l^b \ 

 and if a ap and a bp be known with sufficient accuracy, l a , l b , and I 

 may then be found. It would of course be necessary to check our 

 guess at the value of l p by substituting the value found in 

 expression (12) and seeing whether or not with this value the 

 first three terms would be negligible. 



