118 ON THE VISCOSITY 
molecular conductivity at infinite dilution. Before this ratio 
could be found for 25°C. it was necessary to determine the 
values of the specific conductivity at 25° from * Kohlrausch’s 
values at 18° by means of *Déguisne’s and *Kohlrausch and 
Grotrian’s temperature coetticients. 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 0.25 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 25°C. determined as above from the values at 18°, and the 
calculated ionization coefficients at 25°. Only those coettcients 
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 ionization coefficients in the mixtures by 
the method used. The concentrations are expressed as in ‘fable I, 
and conductivities in terms of 10~* times Kohlrausch’s new 
unit. 
1 Kohl. u. Holb., loc. cit., p. 159, table 2. 
2 Loc: Cit. 
3’ Kohl. u. Holb., p. 145, tab. 1. 
