^6 



current and to the movement of ions by diffusion due to osmotic pressure- 

 has been found to be approximately proportional to the increase in in- 

 ternal friction measured by the rate of flow through a capillary, indi- 

 cating fi'iction as the immediate cause. 



The purpose of the investigation here reported was to attack the 

 problem by a method not hitherto used apparently in this connection. 

 The freezing point method was employed, and the solutions examined 

 were those of hydrochloric acid and sucrose. The freezing points deter- 

 mined Avere those of water, of twice-normal and twentieth-normal water 

 solutions of hydrochloric acid, of water solutions of sucrose containing 1,. 

 5, 10, 25 and 35 grams in 100 cubic centimeters, and of water solutions 

 of hydrochloric acid and sucrose of corresponding concentrations. Tlie 

 ordinary Beckmann apparatus was used. 



It was found that the lowerings of the freezing point produced by 

 known weights of acid and sugar mixed in a given quantity of water 

 was equal to the sum of the lowerings produced by the same weights 

 of acid and sugar each dissolved separately in the same quantity of 

 water. This result harmonizes with those found by the other methods 

 mentioned above in showing no effect of the sugar on the degree of 

 ionization of the acid, and leading to the conclusion that the increase 

 in resistance to the current observed in corresponding solutions of hydro- 

 chloric acid on addition of sugar, was due wholly to an increase in the 

 friction between the ions and the solutions. 



The author desires to express his appreciation of the experinunital 

 work done by Mr. H. E. Bachtenkircliei', B.S., at that time a student 

 in Purdue University. 



Lafayette. Indiana, Dertmbev. Wm. 



