472 Dr. G. Gore. Thermo-Electric Behaviour of [Dec. 11. 



December 11, 1879. 



THE PRESIDENT in the Chair. 



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

 them. 



Professor Joseph David Everett was admitted into the Society. 



The President announced that he had appointed as Vice-Presi- 

 dents : — 



The Treasurer. 



Mr. Busk. 



Sir Joseph Hooker. 



Mr. Simon. 



Dr. Tyndall. 



The following Papers were read : — 



I. ei Thermo-Electric Behaviour of Aqueous Solutions with 

 Mercurial Electrodes." By G. Gore, LL.D., F.R.S. Ke- 

 ceived November 24, 1879. 



In order to investigate this subject, I devised and constructed the 

 following apparatus : — A and B are two thin glass basins, 81 millims. 

 internal diameter ( = 5,153 sq. millims. of mercury surface), and 

 6"0 centims. deep; each containing a layer of mercury about l'O 

 centim. deep, covered by a layer, about 3 centims. deep, of the 

 aqueous solution to be examined. C is a thin bent glass tube, about 

 3 centims. diameter, filled with the liquid, and closed by means of a 

 bung at D * E and !F are stout glass tubes, about 2 millims. bore, 

 E having a platinum wire sealed into it at its lower end, and F being 

 filled with mercury ; the ends of these tubes are usually placed in the 

 mercury previous to adding the liquid ; and E is fixed so that the 

 solution cannot enter it. G and H are terminal wires of platinum, 

 touching the mercury, but not the liquid. I and J are thermometers, 

 with their bulbs immersed in the pools of mercury. Each cup is closed 

 by a bung (not shown in the sketch), to prevent loss of liquid by evapo- 

 ration, also to support the thermometer and keep the tubes steady. 

 The dish B is supported on wire gauze, placed upon an iron tripod 

 with a Bunsen's burner beneath, and A is placed on a shelf level with 



* It is not necessary to have the Tertical limbs of this tube of as great a length 

 as they are shown in the sketch. 



