MTXTUKES OF ELECTROLYTES. M C INTOSH. 133 



small magnitude and shew such alternation of sign as to war- 

 rant the conclusion that they are due chiefly to accidental 

 errors. In the two series of stronger solutions the differences are 

 more irregular in magnitude and the alternation of sign is much 

 less marked, the most of the differences being positive. The 

 above results, therefore, seem to shew that even in the case 

 of two electrolytes with a common ion, which differ so markedly 

 in ionic velocity from one another as sodium chloride and 

 hydrochloric acid, the dissociation theory enables us to calculate 

 the conductivity of solutions containing both, within the limits of 

 experimental error, up to a mean concentration of about 1 

 gramme-molecule per litre, and that in the case of solutions of 

 greater mean concentration, the calculated value is greater than 

 the observed. 



