132 ON THE CALCULATION OF THE CONDUCTIVITY OF 



The following table contains in columns 1 and 2 the concen- 

 trations of the solutions of hydrochloric acid and sodium 

 chloride which were mixed, and in column 7 the measured 

 conductivities of the mixtures, obtained by graphical interpola- 

 tion from the above observations. The 3rd, 4th arid 5th columns 

 give the common concentration of ions and the respective dilu- 

 tions of the electrolytes, in the mixture, as determined by Prof. 

 MacGregor's graphical process. The 6th column gives the cal- 

 culated values of the conductivity, and the 8th the excesses of 

 the calculated over the observed values expressed as percentages. 



It will be seen that in ^he series of weakest solutions, the 

 differences between calculated and observed values are of such 



