205 



Altlious'h consideraI)le work has been done, it has been entirely of a 

 preliminary character. AVith a magnet of pole-strength 415. making 4,000 

 revolutions per minute, with 100 copper wires (w) and 100 German silver 

 wires (w^l. the junior autlior of this paper found that no current was 

 indicated by a galvanometer whose constant was 1.1x10-". The magnet 

 was rotated l)y an electric motor and the galvanometer Avas placed on a 

 pier in an adjoining room some thirty feet distant. Work with electro- 

 lytes is now in progress. 



The senior author is arranging to make the apparatus more sensitive 

 by using an electromagnetic field and a more delicate galvanometer. 

 Results will be given in a future paper. 



