7J MI!. S. W. J. SMITH ON THE NATURE OF ELECTROCAPILLARY PHENOMENA. 



The corresponding curves are shown in fig. 6. In order to find a, the horizontal 

 distances were measured directly from the curves, as it was more convenient to do 

 this than to ohserve the difference between the E.M.F.s required to produce the same 

 Kiirface tension in the different solutions. The E.M.F. of the cell was determined 

 immediately after the corresponding curves had been observed. The same potentio- 

 meter circuit was used in the determination of the curves and of the cell E.M.F. 

 The constancy of this circuit was checked by means of a standard cell. 



The curves for the half normal solutions are not strictly comparable with the 

 others ; they were taken (with the same electrometer) about a year before the latter, 

 under slightly different conditions. Although in the case of the later KC1 solutions 

 the mercury was covered with a layer of calomel, it was not necessary to add a 



