McELFRESH. — OCCLUDED HYDROGEN IN PALLADIUM. 335 



start ; it also appears that the increase of resistance is not strictly pro- 

 portional to the volume of hydrogen occluded. 



Grateful acknowledgment is made of mauy valuable suggestions and 

 much assistance received from Professor E. H. Hall, of Harvard 



College. 



Jefferson Physical Laboratory, Harvard 

 University, May, 1903. 



