563 



concentration, so that a retardation or an acceleration might be caused 

 both by a modification of the hjdrions and by the anions. 



The hydrion-concentration can indeed be kept constant by means of 

 buffer-mixtures, but as these are likewise composed of salts, borates, 

 phosphates, citrates, we should make the results more complicated 

 by adding at the same time other anions. 



The following potassium-salts have been made use of: KCI, KI, 

 KBr, KN()„ KCNS, K,SO,. 



The experiments were executed in entirely the same way as those 

 with different kations. The obtained results were the following: 



