BANCROFT. — POTENTIAL OF METALS. 

 TABLE IV. 



101 



I do not feel sure that there are not errors of 0.1 volt in spite of the 

 fact that I have taken great pains to find the real values. The two 

 points which are of importance may be considered as settled : the 

 concentration has no effect, and the negative ion of the salt solution has 



TABLE V. 



Cd I KCl I Hff. 



an influence both in the combinations ZnlPt, Cd|Pt, and in HglPt. 

 In Table V. there is a complete series of observations on the effect of 

 the concentration. I have made similar series with several other solu- 

 tions ; but as they gave the same result I do not communicate them. 

 When in a halogen solution one of the electrodes is platinum, both the 



