46 



In fig. 2 a graphic represeiilalioii is given of the results oF all 

 examined electrolytes, hut only for concentrations below 6 inMol 

 per litre. We iiave always taken the relative viscosity of the electrolyte- 



1.05 J Change of viscosity in Rubber sols by 

 added electrolytes. 



0.95 



0.90 



0.85 



CH3COOH 

 CsHsCOOH 



Fig. 2. 



free sol as unit, and then plotted the relation 



Vs+e 



— 1 



as ordinates. 



'is — 1 



The behaviour of NH, is in striking agreement with this explana- 

 tion : for it has appeared in all investigations on capillary-electric 

 phenomena that alcalic substances give a higher potential to a 

 negatively charged wall, lowering it again on further addition'). 

 In harmony with this researches in this laboratory by Mr. Lier 

 confirmed the occurrence of an increasing electro-viscosity by hydroxy! 



1) See e.g. G. von Elissaffof, Z. physik. Ghem. 79, 385 (1912); R. Ellis, Z. 

 physik. Ghem. 80, 597 (1912); H. R. Kruyt and A. E. van Aekel, KoU. Z. 32, 

 29 (1923). 



