118 ON THE VISCOSITY 



molecular conductivity at infinite dilution. Before this ratio 

 could be found for 2">C. it was necessary to determine the 

 values of the specific conductivity at 25 from l Kohlrausch's 

 values at 18 by means of 2 Deguisne's and 8 Kohlrausch and 

 Grotrian's temperature coefficients. The concentrations of solu- 

 tions of the salts for which Kohlrausch gives conductivity 

 values, did not in all cases correspond to the concentrations of 

 solutions for which Reyher and Wagner determined the vis- 

 cosity. In such cases (concentrations 0.2."> and 0.125). the values 

 of the specific conductivities at 25 were obtained by inter- 

 polation. 



Table III gives both the values of the specific conductivity 

 at 25C. determined as above from the values at 18, and the 

 calculated ionixation coefficients at 25. Only those coefficients 

 are given which are necessary in the calculation of the vis- 

 cosities. Under copper sulphate are given a few conductivity 

 values of higher concentration, these being necessary for the 

 determination of the ionixation coefficients in the mixtures by 

 the method used. The concentrations are expressed as in Table I, 

 and conductivities in terms of 10~ 4 times Kohlrausch's new 

 unit. 



1 Kohl. u. Holb., loc. cit., p. 159, table 2. 



a Loc. cit. 



5 Kohl. u. Holb., p. 145, tab. 1. 



