6 
Proceedings of Royal Society of Edinburgh. [sess. 
condition, and the other in the hardened condition, then the 
hardened rod is the negatively, and the soft the positively, charged 
element of the cell. 
2. Similar results are obtained by using other electrolytes than 
a salt of the particular metal, but their use is not to be recom- 
mended. 
3. The results of these experiments corroborate previous 
experimental work and theory in connection with the existence of 
two phases of metals. 
I desire to express my thanks to the Executive Committee of 
the Carnegie Trust for the Universities of Scotland, for a grant to 
defray the expenses of this research. 
The University, 
Glasgow. 
( Issued separately February 12 , 1906 .) 
