1277 



mineral salts we used it quite fresh (old tap water also possesses 

 electrifying power). 



In cities with salt-rich tapwater the complication just described 

 will have to be taken into account. 



Physiologically the behaviour of the solutions is of interest when 

 sodium chloride is admixed till a concentration of the latter of 0,9 7» 

 is reached. 



It follows then that of 



Group a. 4 obtain a higher electrifying power, 2 a lower, viz. 

 chinamin and conchinamin. 



(jrvoup h some are strengthened, others are weakened; salicylates, 

 antipyrin and liquid derivatives are strengthened. 



Group c. Antipyrins and chinolins are strengthened, nrethans are 

 weakened, and phenetidins remain unaltered. 



No explanation of the sodium chloride effect has as yet been pro- 

 vided. Our expei'ience with the salicylic acid salts points to a cation 

 effect. To account for the fact we might also have i-ecourse to the 

 change of the surface tension in the dioplets. Certain it is that the 

 size of the droplets very much depends on the nature of the cation. 

 The droplets of sprayed ammonium clilorid solution are much larger 

 than those of sprayed sodium chloride solution (established ultra- 

 microscopically). 



For the rest in splitting the generally very complicate molecules 

 all sorts of additions of electrical power may turn up. 



88 

 Proceedings Royal Acad. Amsterdam, Vol. XX. 



