522 



Mr. G. Gore on 



equally decreased the current. No signs of chemical action were 



observed. 



No. 39. 1 oz. of water and 14 oz. of a saturated solution of sodic 

 carbonate. Platinum plates. Current j 12, and gradually increased 

 to 25 by continuance of beat. Cold water reversed the current. 

 (Compare Nos. 4 and 18.)] 



No. 40. The same mixture. Gold plates. Current J, 28, and re- 

 mained at 28 by continuance of heat. Cold water strongly reversed 

 the current. 



No. 41. The same mixture. Palladium plates. Current J 35, and 

 gradually increased to 40 by continuance of heat. Remarks. The 

 increase of current by continuance of heat in these three last experi- 

 ments is not wholly due to an action of the liquid upon the washers. 

 (Compare Nos. 112, 121, 142, 145, 149, 151, and 153.) 



No. 42. 12 oz. of water, 4 oz. of crystals of cupric sulphate, and J- oz. 

 of pure concentrated sulphuric acid. Gold plates. Current j 48. 

 Cold water decreased the deflection to 30. 



No. 43. The same mixture. Platinum plates. Current j 50. Cold 

 water diminished the deflection to 30. (Compare No. 127.) 



No. 44. The same mixture. Palladium plates. Current f 37^. Cold 

 water sent the needles back strongly. (Compare No. 15.) 



No. 45. 2 oz. of water and 12 oz. of a saturated solution of sulphate 

 of potassium. Solution very faintly blued neutral litmus paper. 

 Platinum plates. Current J, If. Cold water produced a feeble 

 upward current. 



No. 46. The same mixture. Gold plates. No current. Palladium 

 plates. Current J 2J. 



No. 47. 3 oz. of water and 12 oz. of a saturated solution of acid 

 sulphate of potassium. Liquid strongly acid to litmus paper. Palla- 

 dium plates. Current J J. Cold water produced a very feeble j current. 



No. 48. The same mixture. Gold plates. No current. Platinum 

 plates. No current, but cold water produced a feeble downward 

 current in each case. Remarks. The acid sulphate behaved very much 

 like the neutral sulphate in these and other experiments, and both 

 behaved like the corresponding chromates. (Compare No. 128.) 



No. 49. 14 oz. of water and f oz. of crystals of cupric acetate. Gold 

 plates. No current. Cold water produced a feeble j current. 



No. 50. The same mixture, with platinum plates. Current J M 

 Palladium plates. No current. Cold water produced a feeble \ cur- 

 rent, in each case. 



No. 51. The same mixture, with 3 oz. of glacial acetic acid added to 

 it. Palladium plates ; no current. Gold plates ; current f 1\. Pla- 

 tinum plates; current j 1-J. Coid water produced a downward current 

 in all three cases. (Compare No. 122.) 



No. 52. 12 oz. of water and 4oz. of yellow chromate of potassium. 



