526 



Mr. G. Gore on 



solution. Platinum plates. No current. Gold plates. Current J \ . 

 Palladium plates. Current J 1. Cold water produced a very feeble 

 upward current in each instance. 



No. 91. 14 oz. of water and 1 oz. of crystals of nitrate of barium. 

 Neutral solution. Platinum plates. Current J 1J. Gold plates. 

 Current J If. Palladium plates. Current \ f . Cold water reversed 

 the deflection feebly in each instance. 



No. 92. 14 oz. of water and 3 oz. of baric chloride. Neutral solution. 

 Platinum plates. Current J 1-J at 200° F. Gold plates. Current | 1-J. 

 Palladium plates. Current \ 2f. Cold water reversed the deflection 

 feebly in each instance. 



No. 93. 14 oz. of water and 1 oz. of crystals of ordinary phosphate 

 of sodium. Solution strongly alkaline to litmus paper. Platinum 

 plates. Current \ (Compare No. 133.) Gold plates. Current } If. 

 Palladium plates. Current J 3. Cold water produced a feeble f current 

 in each case. 



No 94. 14 oz. of water and \ oz. of crystals of permangante of 

 potassium ; pure india-rubber washers. Platinum plates. Current 

 J 50 at 290° F. Cold water reduced the deflection to zero. A thin 

 film of oxide of manganese was found all over the surface of the upper 

 plate only, and a line of the oxide upon each plate close to the edge of 

 the washers, especially on the upper plate. (Compare No. 161.) 



No. 95. The same mixture. Gold plates. Current J 6 at 120° P., and 

 1 at 210° P. Palladium plates. Current J 51^ at 170° P., and 42 at 

 210° P. Cold water reversed the deflection strongly in each case. 



No. 96. 14 oz. of water and 1 oz. of ammonia alum. Solution 

 strongly acid to litmus paper. Gold plates. Current j 1^ at 180° P., 

 and | at 210° F. Palladium plates. Current f 1\ at 200° P. Platinum 

 plates. Current \ 1. (Compare No. 136.) Cold water either reduced 

 or reversed the deflection in each instance. 



No. 97. 14 oz. of water and 1 oz. of potassium alum. Strongly acid 

 to litmus paper. Palladium plates. Current J 1^. Platinum plates. 

 Current \ 1. Gold plates. Current \ 1-J. Cold water reversed the 

 deflection in each case. 



No. 98. 14 oz. of water and 2 oz. of slightly decomposed iodide of 

 potassium. Solution alkaline to litmus paper. Palladium plates. 

 Current J 44 at 140° P., and 34 at 210° P. Cold water first in- 

 creased the deflection and then reduced it to 31. No signs of cor. 

 rosion. 



No. 99. The same mixture. Platinum plates. Current J 50. (Com- 

 pare No. 132.) Gold plates. Current J 45. Cold water reduced the 

 deflection in each case, and no signs of corrosion appeared. 



No. 100. 10 oz. of water and 4 oz. of a saturated solution of bromide 

 of potassium. Solution alkaline to litmus paper. Palladium plates, 

 current J 2 J. Platinum plates. Current \ lj. (Compare No. 137.) 



