56 



Dr. G. Gore. 



Liversidge (A.) Waters from Hot Springs, New Britain and Fiji. 

 The Action of Sea-water upon Cast-iron. Notes npon some 

 Minerals from New Caledonia. On the Composition of some 

 Coral Limestones, &c, from the South Sea Islands. The Alkaloid 

 from Piturie. On some New South Wales Minerals. On the 

 Composition of some Wood inclosed in Basalt. 8vo. Sydney 

 1880-81. The Author. 



Nicholson (H. A.) On the Structure and Affinities of the Genus 

 Monticulipora and its Sub-genera. 8vo. Edinburgh and London 

 1881. The Author- 



Siemens (C. W.), F.R.S. On the Dynamo-electric Current. 4to. 

 Gas and Electricity as Heating Agents. 8vo. London 1881. 



The Author. 



Impression in Wax of Seal-portrait of Sir Isaac Newton. 



B, Etheridge, Esq., F.R.S. 



" Influence of Voltaic Currents on the Diffusion of Liquids."* 

 By G. Gore. LL.D., F.R.S. Received December 1, 1880. 

 Read December 16. 



1. General Statement of the Phenomena. 



In a recent preliminary statement (see " Proc. Roy. Soc," vol. 30, 

 p. 322) I have mentioned that " when an electric current was passed 

 between the surfaces of mutual contact of certain aqueous solutions of 

 different specific gravities, the boundary surfaces of contact of the two 

 liquids became indefinite where the current passed from the lighter 

 m.to the heavier solution, and became sharply defined where the current 

 left the heavier and re-entered the lighter liquid ; and that on reversing 

 the direction of the current several times in succession after suitable 

 intervals of time, these effects were reversed with each such change. 

 Also, in various cases in which the contiguous boundary layers of the 

 two liquids had become mixed, the liquids separated, and the line of 

 separation of the two solutions became by the influence of the electric 

 current as perfect as that between strata of oil and water lying upon 

 each other." 



These and other phenomena which accompany them form the subject 

 of the present communication. 



The chief additional phenomena observed have been — 1st. The pro- 

 duction of definite lines, not only where the current passed from the 



■ * This research arose out of one on " The Phenomena of the Capillary Electro- 

 scope." See " Proc. Koy. Soc," vol. 31, p. 295. 



