565 - 



As now the influence of the kations is greater than that of the 

 anions, we had better compare 



1 K' + 1 C\' and 1 K' + V, SO," 

 than IK.-flCl' and 2K-+1S0;'. 



It appears from a comparison of IVlgSO, and MgCl^, which exercise 

 about the same influence at an equal concentration of magnesia, 

 that reallj' for the same kation the action of 1 SO," corresponds 

 with that of 2 CI', consequently that of V, SO/ with that of 1 CI'. 



We may deduce from the results that we have obtained, that for 

 the action of neutral salts on the decomposition of ureum by urease 

 the kations have a domineering influence, and that the succession 

 in which those kations can be placed, in accordance with their 

 faculty of retardation, is about the same as that which we find at 

 the flaking and at other colloidal phenomena. 



The nature of the anion has comparatively little influence ; in so 

 far as we can still observe at anions an increasing faculty of retard- 

 ation, the series into which they can be placed corresponds like- 

 wise with the series occurring in colloidal chemistry. 



Consequently it is possible that the influence that neutral salts 

 exercise on a ferment-action consists in the fact that the dispersity 

 of the ferment is modified by the ions in the same way as with 

 other colloids. 



Physiol. Lab. of the Univ. of Amsterdam. 



