168 THEORY OF COLLOIDAL BEHAVIOR 



oily and watery phases, since this theory only demands that one 

 ion of the oily phase should be prevented from migrating into 

 the watery phase. Any lipoid ion would fulfill this postulate 

 of the theory. The peculiarities of electrolytic dissociation 

 found by Beutner in non-aqueous solutions must, however, influ- 

 ence the Donnan equilibrium in a secondary way, since this 

 equilibrium depends upon ionization. 



