45 



The viscosity of tlie XHj-beiizetie mixtures (iie) did not appreciably 

 differ from tliat of benzene. 



T/s+e 



1.700 



I.G50 



l.£00 



I.SSOt 



1.500 



Rubber sol 

 Benzoezuur 



m Mot per Liter loo 

 Fig. 1. 



200 



TABLE IL 

 Influence of ammonia on the viscosity of rubbersols. 



Cone, ammonia 

 mMol p. L. 



Viscosity 

 rubber — NHs 



r,s+e 

 corrected 







0.37 

 0.75 

 1.49 

 2.98 

 5.96 

 11.92 

 23.85 

 



1.608 

 1.616 

 1.622 

 1.625 

 1.622 

 1.620 

 1.620 

 1.621 

 1.611 



1.608 

 1.616 

 1.621 

 1.624 

 1.620 

 1.618 

 1.618 

 1.618 

 1.608 



It appears from this iliat ilie viscosity of the sols rises by addition 

 of ammonia, reaches a maximum, and then descends. 



3. The great change of viscosity by an added substance in so 

 small a concentration as is the case with the acids, certainly makes 

 the impression of an electro-viscous effect. 



