524 



Mr. G. Gore on 



tion neutral to litmus paper. Palladium plates. Current j 6^- at 160° F« 

 and 1\ at 210° F. Cold water produced a strong J current. 



No 66. The same mixture. Platinum plates. Current \ 10. (Com- 

 pare No. 130.) Gold plates. Current J 11. Cold water strongly 

 reversed the current in each case. 



No. 67. A nearly saturated solution of sulphate of magnesium. 

 Neutral to litmus paper. With palladium, platinum, or gold plates, 

 no current. Cold water produced a very feeble downward current in 

 each case. 



No. 68. 12 oz. of water and 4 oz. of very pure crystals of nitrate of 

 lead. Solution was acid to blue litmus paper. Gold plates. Current 

 I 1. Palladium plates. Current J -§-. Platinum plates. Current J ^. 

 Cold water reversed the current in each case. 



No. 69. A nearly saturated solution of pure calcic chloride. Neutral 

 to litmus paper. Platinum plates. Current J -J. Cold water produced 

 a feeble upward current. Gold plates ; no current. Palladium plates ; 

 current J ^. Cold water reduced the deflection nearly to zero. 



No. 70. 12 oz. of water and 4 oz. of extremely pure anhydrous car- 

 bonate of potassium. Platinum plates. Current j 2. Cold water 

 reversed the deflection. (Compare No. 121.) 



No. 71. The same mixture. Gold plates. Current J 2J, and 4^ by 

 continuance of heat. Cold water first increased the deflection, and 

 then reduced it nearly to zero. 



No. 72. The same mixture. Palladium plates. Current { 20, and 

 increasing by continuance of heat. Cold water sent needles back to 

 zero. 



No. 73. 13 oz. of water and 2 oz. of dry chloride of manganese. 

 Solution acid to litmus paper. Palladium plates. Current \ 58-|- at 

 180° F., and 41 at 210° F. Cold water reduced the amount of deflec- 

 tion. There were very faint signs of corrosion of the upper plate. 



No. 74. The same mixture. Platinum plates. Current j 63-J. 

 (Compare No. 114.) Gold plates. Current f 63£. Cold water reduced 

 ihe current greatly in each case. No signs of corrosion in either in- 

 stance. 



No. 75. A moderately strong solution of very pure chloride of zinc. 

 Solution nearly neutral to litmus paper. Palladium plates. Current 

 | J; Gold plates ; no current. Platinum plates. Current j |-. Cold 

 water reversed the deflection in all three instances. 



No. 76. 13 oz. of water and 2 oz. of dry perchloride of iron. The 

 solution was acid to litmus paper. Palladium plates. Current f 1\ at 

 120° F., and J 18 at 210° F. Both the plates were corroded, especially 

 the upper one. 



No. 77. The same mixture. Platinum plates. Current \ 72 J at 

 210° F. No signs of corrosion, but a film of sesquioxide of iron or of 

 basic salt of iron was found all over the upper plate only. (Compare 



