of Electrolytes on Volta-electromotive Force, 

 Fig. 4— KC1 25 grains, with ZnPt at 21° C. 



Volts. 

 1-310 



1-305 



487 



. ! 



1-210 

 1-205 



Grains of water. \ 



The greater effect of the first added unit quantity is in this 

 case also clearly manifested. 



With the object of arriving at some idea of the relative 

 amounts of effect of the first and last unit portions of potas- 

 sium chloride added to water, and to obtain a complete curve 

 of electromotive force of that salt in water, the degrees of 

 electromotive force with a zinc-platinum couple were mea- 

 sured, using five series of aqueous solutions of the salt, com- 

 prising the entire range from water to a saturated solution. 

 In order also to show the manifest effect of an extremely 

 minute quantity in the first addition, and not to extend the 

 entire curve to an extraordinary length, it w r as found neces- 

 sary to divide the entire range into five sections, and to 

 increase the magnitude of the unit quantity to ten times its 

 amount in each successive section ; the unit quantities added, 

 therefore, are 10,000 times larger in the last section than in 

 the first one. 



