62 



Dr. G. Gore. 



convex and cloudy, the other one was blue, clear, and slightly con- 

 cave ; its blue portion became nearly 12 millims, thick. Reversal of 

 current was soon followed by reversal of these effects. The total bulk 

 of the lower liquid increased during the experiment. 



Exp. 16. — Lower liquid a saturated solution of potassic cyanide,, 

 coloured blue by litmus ; upper one, 2 ozs. potassic chloride dissolved 

 in 12 ozs. of water. Conduction copious. Definite line produced in 

 two minutes at about 2 millims. above the blue solution below cathode, 

 and the blue colour soon ascended to it. Positive meniscus became 

 definite and greenish. The mass of lower liquid appeared to move in 

 a direction opposite to the current. 



Exp. 17. — Lower liquid same as in last experiment; upper one, 

 4 ozs. of a saturated solution of sodic carbonate and 8 ozs. of water- 

 Weak conduction. The line at negative meniscus was more definite 

 than that at positive one. After reversal of current this effect was 

 also reversed. The line began to form at about 2 millims. above the 

 blue liquid under anode. The blue liquid appeared to move in a 

 direction contrary to that of the current. 



Exp. 18. — Tubes 18 millims. long and 7*5 millims. bore. Lower 

 liquid as in last experiment ; upper one, 1 oz. of acid sulphate of 

 sodium in 12 ozs. of water. Free conduction. A line appeared at 

 once in very dilute part of cyanide solution below anode, and on re- 

 versing current it appeared immediately in the other tube. Soon also 

 solid salt formed at the positive meniscus (probably potassic sulphate), 

 as if much downward electric diffusion of acid occurred there, the 

 colour also became weaker ; no salt formed at the very definite nega- 

 tive meniscus. By reversing the current a dilute space was produced 

 between the deep blue coloured cyanide below and the light blue 

 above near the line of negative meniscus. The mass of lower liquid 

 appeared to move in the direction of the current, contrary to what 

 usually occurs with a solution of potassic cyanide. The total bulk of 

 the blue liquid increased. 



Exp. 19. — A one-fourth saturated solution of acid sulphate of sodium 

 beneath, and dilute nitric acid 1 to 10 above. Copious conduction. 

 In three minutes a line commenced to appear 1*75 millim. above 

 positive meniscus in pale red portion. Liquid appeared to move in 

 the direction of the current. 



Exp. 20. — Same solution of coloured potassic cyanide below as in 

 Experiment No. 18, and one of 1^ oz. of potassic ferrocyanide in 

 12 ozs. of water above. Free conduction. Definite concave line in 

 half a minute in tube below anode. Stopped current, the line became 

 at once flat. Reversed current, a curved line appeared in colourless 

 portion of liquid of tube below the anode in 1-J minute, 1*75 millim. 

 above visible blue portion, and sank down into the blue in half a 

 minute. Blue colour in tube below cathode rose,\nd became weaker 



