1885.] " Transfer-Resistance " in Electrolytic Cells, 209 

 If the assumption in question is valid, there follows the relation 

 1 - 11(1 + w sin* amp) = — (a iC os^ + 2AoCos — 1+ . . . V, 



K r n I 1 n ii J 



or, in other words, the elliptic functions of the third kind, sin amp, &c. y 

 can be expressed by harmonic series involving multiples of 



March 19, 1885. 



THE TREASURER in the Chair. 



The Presents received were laid on the table, and thanks ordered 

 for them. 



The following Papers were read : — 



I. " On ' Transfer-resistance ' in Electrolytic and Voltaic Cells.' r 

 By G. Gore, LL.D., F.R.S. Received March 2, 1885. 



(Abstract.) 



The existence of this phenomenon has been a matter of doubt ever 

 since the year 1831, and the question has been examined by many 

 investigators. In the present paper are described a series of methods 

 by means of which its reality has been determined. Other methods 

 are given for measuring the amounts of such " resistance," either 

 collectively at the two electrodes of an electrolytic cell, or separately 

 at each electrode. Modes of obviating the interference of polarisa- 

 tion, and of securing success in the measurements, are also described. 



The influence of various circumstances upon the phenomenon were 

 investigated, viz., strength and density of current; total resistance; 

 density of current and size of electrode ; composition of the electrolyte ; 

 strength of ditto ; combined electrolytic cells ; temperature ; and 

 chemical corrosion. The relations of the phenomenon to size of plate 

 in voltaic cells, to the positive and negative plates respectively, and 

 to strength of current in those cells, were also examined, and the 

 results are given. 



The following are the chief facts established by this research : — 

 That a species of electric " resistance," distinct from that of polarisa- 

 tion and of ordinary conduction-resistance, varying greatly in amount 

 in different cases, exists at the surfaces of mutual contact of metals 

 and liquids in electrolytic and voltaic cells. That this "resistance" 



