386 



BULLETIN OF THE UNIVERSITY OP WISCONSIN. 



a degree of dissociation equal to 76$, according to Carrara, 1 the 

 solute being tri-ethylsulphine iodide, (C 2 H 5 ) 3 SI. Under V 

 the volume in liters is given in which one gram molecule of sub- 

 stance is dissolved. The dielectric constants in the second col- 

 umn are those found by Drude, while those in the third col- 

 umn are taken from the results of Nernst, Tereschin, and 

 Thwing. According to the Nernst-Thomson rule the volumes 

 should increase' as the D. C. decreases. 



Table XII. 



Solvent. 



Water 



Methyl alcohol 

 Ethyl alcohol. . 

 Propyl alcohol 

 Allyl alcohol . . . 

 Acetone 



Volume. 



39.6 



504.0 



1015.0 



89.0 

 498.0 



An inspection of the table shows that with one exception there 

 is a general parallelism between dissociating power and dielec- 

 tric constant, but the example of allyl alcohol is certainly a 

 striking exception. 



Table XIII gives the approximate volumes of various sol- 

 vents in liters in which a gram molecule of potassium iodide is 

 dissociated to the extent of 75$. 



In this case we have another exception in liquid ammonia 

 and acetone. 



J Zeit. Elektrochem. 4, 475, (1897-93). 



