114 



ROYAL SOCIETY OF CANADA 

 TABLE I. Contd. 



Off the scale, Three days after No. 38. 

 475 



Off the scale, 

 740 



Four days after No. 39. 



Throughout the investigation the Volta effect seemed to be of 

 considerable importance, so much so that the writer was led to under- 

 take a series of experiments to determine, if possible, by a somewhat 

 similar method, the contact potential difference between two metals. 

 A few measurements have been made, and these seem to indicate that, 



