McELFRESH. — OCCLUDED HYDROGEN IN PALLADIUM. 335 



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

 portional to the volume of hydrogen occluded. 



Grateful acknowledgment is made of many valuable suggestions and 

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

 College. 



Jefferson Physical Laboratoev, Harvard 

 Universitt, May, 1903. 



