334 CONDUCTIVITY OF AQUEOUS SOLUTIONS.—McKAY. 
four weakest all positive, the differences exhibit the alternation 
of sign which we would expect if they were due to accidental 
errors. 
The results of the experiments, therefore, lead the writer to 
conclude that it is possible, by means of the dissociation theory, 
to calculate the conductivity of mixtures of solutions of the 
chlorides of sodium and barium at least for solutions whose 
concentrations are not above 2 gramme-equivalents per litre. 
