76 



Dr. G. Gore. 



of the liquid in the tube could be detected, either during the passage 

 of the current, or immediately afterwards, the only visible movement 

 was that of vertical currents of the liquid outside the tube, evidently 

 caused by change of specific gravity, due to heat of electric con- 

 duction resistance produced within the tube. 



In three further trials, three solutions consisting of 5, 55, and 

 255 grs. of potassic cyanide, dissolved in 12 ozs. of water, were em- 

 ployed, but with less effect than in the previous experiment. 



To further determine whether there existed a movement of mass 

 due to actions taking place at the mutual contact surfaces of the 

 liquids, I made some experiments with two liquids in the apparatus, 

 the mode of operating being as follows : — A heavier coloured liquid 

 (containing suspended sulphur) was poured by means of a long-necked 

 funnel into the tubes D, E, and P, until after expulsion of all air from 

 O, the meniscus of the liquid stood at the level indicated by the 

 dotted lines W and X. Corks (previously fixed on the ends of 

 platinum wires) were now placed rather tightly in the upper ends of 

 D and E, the two electrodes inserted, and the lighter colourless liquid 

 poured simultaneously into A and B, until the level of liquid was 

 exactly the same in each. After all flow of liquid in P had ceased, 

 the corks were withdrawn with extreme slowness, so as not to cause 

 the two liquids to mix at their surface of mutual contact. The further 

 details of manipulation were the same as those previously described. 



In a first experiment with two liquids, the lower one consisted of a 

 saturated solution of cupric sulphate, containing suspended particles 

 of sulphur, and the upper one of a mixture of 19 volumes of water 

 and 1 of pure sulphuric acid, and the glass tube P was of the dimen- 

 sions already given. No movement of the solution in or near P, 

 except those already mentioned, could be detected. 



In a second experiment, the lower liquid consisted of 1 measure 

 of strong pure nitric acid, and 7 measures of a saturated solution 

 of cupric nitrate ; and the upper one of a mixture of 1 volume of 

 pure nitric acid, and 6 of water. The glass tube P was 15 millims. 

 long, and 2*3 millims. internal diameter. The results were similar to 

 the previous one. 



The small tube P was now removed, and a very thin disk of talc, 

 having a minute hole about 1*0 millim. diameter in its centre, was em- 

 ployed in its stead. The disk was fitted water-tight by means of 

 varnish. A current from twenty-five Grove's cells in single series 

 was now used ; and a single liquid consisting of 1 measure of 

 sulphuric acid, and 2 J measures of water was employed. Free conduc- 

 tion occurred, and large bubbles of steam were produced on each 

 side of the hole. The current was reversed in direction several 

 times ; the tube being occasionally closed. No translation of the 

 mass due to the current could be detected, the only movements pro- 



