616 



investigated solutions of CiiSO,, ZiiSO, nnd NiSO, in the concentra- 

 tion of 10 grams per litre. Because current potential and electro- 

 endosmose are so to say each other's reflected image '), one 

 may rather expect that the electrolyte concentration will make 

 itself felt in a similar manner in regard to those two phenomena. 

 As Elissafoff (1. c.) found that even exceedingly feeble electro- 

 lyte concentrations strongly diminish or suspend the electro- 

 endosmotic transport, we can only assume from the negative result 

 of GouRE DE "ViLLEMONTÉK that in the concentrated solulions used by 

 him the potential is already lowered to about zero. Riety's result ') 

 have also confirmed this conclusion. 



Grumbach '), who investigated thé influence of non-electrolytes on 

 the current potential, has not used pure water as comparison liquid 

 but a KCl-solution of the concentration 1 millimol. per litre and in 

 this manner obtained positiv results. In the investigation here 

 described 1 have made use in many respects of the experimental 

 methods mentioned in Grumbach's paper. 



Ace. 



'-) Vgl. Saxen, Wied. Ann. 47, 16 (1892). 

 2) 1. c. 

 8) 1. c. 



