4 ELECTROMOTIVE FORCE OF IRON AND OCCLUDED HYDROGEN. 



present results, although only a part of the whole plan, are reasonably com- 

 plete in themselves, and therefore worthy of separate publication. The 

 subject will be taken up again in the near future. 



For the sake of clearness and convenience, the present paper will be 

 divided into two parts, entitled : Part I. " The Electromotive Force of Pure 

 Iron under Varying Conditions ; " Part II. " The Electromotive Force of 

 Iron Containing Occluded Hydrogen." 



