A. R. MOORE AND F. M. KELLOGG. 



hard rubber trough, 5 cm. X 5 cm. X 20 cm. and containing I cm. 

 depth of tap water. The current, from the ordinary lighting 

 circuit, passed through a water rheostat, pole changer, milliam- 

 meter and key, and was received at either end of the trough by 



FIG. i. 



non-polarizable electrodes made of wet filter paper. The strength 

 of current used varied between 20 and 100 milliamperes per 

 square decimeter, voltage no. As soon as the current was made 



