114 ON THE CALCULATION OF THE CONDUCTIVITY OF 



tained in Kohlrausch's tables of interpolated values, ascribing 

 them (1) to his own observations being the results of actual 

 measurements, and (2) to the different temperatures at which 

 their respective solutions had the specified strength. These 

 differences are shewn in the following table : 



It will be noticed that the differences are all of the same sign 

 up to conductivities of about 1800, and nearly all of the opposite 

 sign for higher conductivities ; also, that for any given conduc- 

 tivity the difference is of the same sign and of about the same 

 magnitude for solutions of both salts. If they were due to the 

 first of the above causes, since Kohlrausch's interpolated values 

 agree well with his observations we should expect more alternation 

 of sign ; if to the second, there should be no change of sign ; if 

 to both, there should be greater and more irregular variation in 

 the magnitude. The fact that the differences are practically the 

 same for both electrolytes at any given value of the conductivity 

 would seem to show that the cause of the differences, a defect in 

 the apparatus possibly, or in the distilled water, was operative 

 in the measurements of both sets of simple solutions, and there- 

 fore probably in the measurements of the mixtures. Hence, to 

 render the results of calculations based on Kohlrausch's data for 

 the simple solutions, comparable with Bender's results for 



