1887 .] Mr W. Peddie on Electrolytic Polarization. 
107 
2. On the Increase of Electrolytic Polarization with Time. 
By W. Peddie, Esq. Communicated by Professor Tait. 
In a paper communicated to this Society last Session I described 
some preliminary experiments on this subject, which led to the 
approximate empirical formula connecting current-strength and time 
. 7 -ct-hde~ et 
i = a + oe 
where a, b, c, d, and e are constants of positive sign. The electrodes 
used were of platinum, and had a surface area of about 5 sq. cm. 
Subsequently I have used platinum electrodes having an area of 
