1'^ Pn>f. .1. .1. Thomson, fin // /V.y.,/,/,r'/,,,; <>f the [Jan. !.">. 



ho.vover, detect any difference hot worn the positive and negative 

 elect Hides in this respect. The ir:ise>; in which tliis effect was found 

 w.-iv I, HC1, and HI. 



I next endeavoured to see if I could detect any difference in the 

 chemical action of chlorine on a meta! positively or negatively elec- 

 trified. This was done in the following way : A and B (fig. 4) are 



Tin. 4. 



two coils of copper wire, of the same length, made from the same 

 hank of wire, and as nearly as possible alike in all respects: these: 

 are filled into two equal vessels which are connected by a U-tube 



