112 ON THE CALCULATION OF THE CONDUCTIVITY OF 



in the case of each salt in terms of reciprocals of powers of V. 

 In obtaining these formulae, I made use of Kohlrausch's data 

 only, Kohlrausch and Grotrian's data not being at the time 

 Available to me. As the experimental data from which the 

 formulae were obtained, applied to a much greater range of 

 -dilution than that of the parts of the curves in the drawing of 

 which these formulae were used, I did not think it necessary to 

 re-determine the formulae when Kohlrausch and Grotrian's 

 observations carne into my hands. The following tables shew 

 the accuracy with which the formulae reproduced the experi- 

 mental data on which they were founded : 



NaCl SOLUTIONS. 



KC1 SOLUTIONS. 



As the formulae, owing to the narrow range of their applica- 

 bility, are of no permanent value, they need not be given here. 

 The consistency of the results of the calculations based on them, 

 AS given in the table below, would seem to show that they were 

 sufficiently accurate for the purpose in hand. 



As Bender measured the specific gravities of both his simple 

 solutions and his mixtures, his paper affords the necessary data 

 for determining the change of volume on mixing. Such change 



