48 IONIZATION COEFFICIENTS. ARCHIBALD. 



If we compare the percentage differences of the above table 

 with the corresponding differences in the case of the constituent 

 simple solutions (Table IV, p. 45), it will be seen that the former 

 are in general equal to the arithmetic means of the latter. Hence 

 the depressions of the freezing-point of the mixtures have been 

 calculated with the same degree of accuracy as those of the 

 simple solutions. 



The test which has thus been applied to Prof. MacGregor's 

 method of determining the ionization coefficients in a solution 

 containing two electrolytes with a common ion, and which the 

 method has completely satisfied, .is, however, not a severe one. 

 It was intended, after the experiments on equimolecular solu- 

 tions, to take up mixtures of solutions of different concentra- 

 tion with respect to the two electrolytes. Unfortunately I was 

 prevented from doing so by lack of time. 



In conclusion, I wish to express my thanks to Prof. 

 MacGregor for valuable suggestions kindly given. 



