1^9 



PROCEEDINGS OP THE AMERICAN ACADEMY. 



Stoppers. Through these stoppers ran the tubes for supplying the 

 hydrogen used to excIudB oxygen from the process, as well as the sup- 



FlGURE 4. 



ports for the electrodes. Two anodes (B and C) were used in each cell, 

 and in all except the earliest experiments the cathodes (A) were of 

 platinum. A diagram, Figure 4, while illustrating a later modification, 



