60 



Dr. G. Gore. 



Exp. 5. — Lower liquid, \\ ozs. of potassic bichromate dissolved in 

 12 ozs. water ; upper one a half saturated solution of sodic carbonate. 

 Conduction moderate. The bulk of the lower liquid appeared to move 

 in a direction opposite to that of the current, and its level became 

 8 millims. lower in the tube under the cathode than in that under 

 anode. A double meniscus line formed in the positive tube {i.e., under 

 cathode). Gas was evolved at the positive meniscus, probably car- 

 bonic anhydride. Positive meniscus became ultimately 12 millims. 

 lower than negative one. On stopping the current the positive 

 meniscus rose and the negative one fell immediately. 



Exp. 6. — Lower liquid, a saturated solution of cupric sulphate, 

 upper one dilute nitric acid 1 in 12. Copious conduction. Blue 

 liquid rose in tube under cathode, and sank in that under anode. 

 Positive meniscus very definite, negative one diffuse. 



Exp. 7. — Now employed a single series of six Grove's elements in 

 all the experiments to No. 34. Lower liquid a saturated solution of 

 mercuric nitrate (not coloured) ; upper one, dilute nitric acid 1 in 12. 

 Free conduction. A layer of white powder, 25 millims. thick, soon 

 accumulated at the positive end of the lower liquid. Reversal of 

 current quickly caused the salt to disappear, and to reappear at the 

 opposite (now the positive) meniscus. Remarks. — The white powder 

 was probably salt accumulated by the influence of the current. 



Exp. 8. — Lower liquid a nearly saturated solution of yellow potassic 

 chromate; upper one same as in last experiment. A thin layer of solid 

 red salt set free at each meniscus by chemical action. Now passed the 

 current. Salt at positive meniscus dissolved quickly. Positive meniscus 

 descended slowly and negative one ascended, as if the lower solution 

 moved in an opposite direction to that of the current. 



Exp. 9. — Lower liquid a saturated solution of cupric nitrate ; upper 

 one same as in last experiment. Copious conduction. The definite 

 line commenced to be visible at positive meniscus in two minutes, and 

 soon became of a deeper blue colour than the layer of solution imme- 

 diately below it, as if the blue colour ascended and caused the colour 

 to become concentrated as it progressed. 



Exp. 10. — Lower liquid a saturated solution of cupric chloride ; 

 upper one same as in last experiment. Copious conduction. Definite 

 line of blue colour soon formed at positive meniscus. The solution 

 below negative meniscus being green. Reversal of current reversed 

 these effects. Remarks. — The line of blue colour at the positive 

 meniscus may have been due to electrolytic accumulation of basic 

 chloride, or to electric diffusion of nitric acid. Dilute nitric acid does 

 produce such a change of colour in a solution of cupric chloride. 



Exp. 11. — Tubes 18 millims. long and 5 millims. bore. Lower 

 liquid a nearly saturated solution of cupric nitrate ; upper one dilute 

 nitric acid 1 in 10. Very free conduction. In two minutes the nega- 



