356 



BULLETIN OF THE UNIVERSITY OP WISCONSIN. 



exceptions also appeared which point to a marked specific in- 

 fluence of the solvent. Some of these exceptions are noted and 

 considered in another part of this paper. 



The following table taken from Nernst's 1 Theoretical Chem- 

 istry illustrates the general parallelism between the dielectric 

 constant and the dissociating power. 



Table I. 



Since the formulation of the ISTernst-Thomson rule excellent 

 new methods for determining dielectric constants have been de- 

 vised by Thwing, 2 Nernst, 3 and Drude ; 4 and these investigators 

 have measured the dielectric constants of a number of sub- 

 stances. The pupils of Nernst, and of Drude, and others have 

 elaborated, modified and perfected these methods, so that the 

 determination of dielectric constants at ordinary temperatures 

 is now a comparatively simple operation. During this period 

 the electrical conductivity of non-aqueous solutions has also re- 

 ceived considerable study, and the dissociating power of various 

 solvents, which yield conducting solutions, has moreover been 

 investigated by means of cryoscopic and boiling-point determin- 

 ations. The selected examples given in the following table will 

 serve to show that various other solvents besides water possess 

 ionizing power in a very marked degree. Under V, in the third 



i P. 365, third edition. (1900). 



' Phys. Review, 2, 35. (1894). Also Zeit. phys. Chem. 14, 286. (1894). 



3 Zeit, phys. Chem. 14, 622. (1S94). 



* Zeit. phys. Chem. 23, 267. (1897). 



