I907.] MAGIE— THEORY OF SOLUTIONS. 145 



The hypothesis developed in this paper does not prechide a 

 kinetic explanation of osmotic pressure. This has been shown 

 recently by Lowry^ and the argument does not need to be repeated 

 here. 



The representation of the molecular conductivity as a sum of 

 two ionic velocities, according to the theory of Kohlrausch, seems 

 to be inconsistent with the assumption of any such action between 

 the ions and the water as will form stable hydrates, at least if the 

 only free electric charges present in the groups constituting the 

 hydrates are those belonging to the ions of the solute. If, how- 

 ever, we assume, as has been done in this paper, that the action of 

 the ions does not form stable groups of water molecules, but only 

 such associations of them that the ion can pass through the water 

 without dragging a group of water molecules with it, we can then 

 use this hypothesis without modifying the commonly accepted ex- 

 planation of electrolytic conduction. 



Princeton, N. J., April 19, 1907. 



^ Phil. Mag., April, 1907. , 



PROC. AMER. PHIL. SOC, XLVI. 185J, PRINTED JULY 16, I907. 



