136 CORRELATION OF THE PHYSICAL FORCES. 



other metal, then the action would take place, 

 and it would become covered with copper. 

 Now, is not this most wonderful and beautiful 

 to see ? We still have the identical chemical 

 force of the particles of zinc acting, and yet in 

 some strange manner we have power to make 

 that chemical force, or something it produces, 

 travel from one place to another for we do 

 make the chemical force travel from the zinc to 

 the platinum by this very curious experiment 

 of using the two metals in the same fluid in 

 contact with each other. 



Let us now examine these phenomena a little 

 more closely. Here is a drawing (jig. 45) in 

 which I have represented a vessel containing 

 the acid liquid and the slips of zinc and plati- 

 num or copper, and I have shown them touching 

 each other outside by means of a wire coming 

 from each of them (for it matters not whether 

 they touch in the fluid or outside by pieces of 

 metal attached, they still by that communication 

 between them have this power transferred from 

 one to the other). Now, if instead of only using 

 one vessel, as I have shown there, I take 

 another, and another, and put in zinc and 

 platinum, zinc and platinum, zinc and platinum, 



