M6 



Dr. G. Gore. On the 



[Dec. 16, 



No. 16. A mixture of thirty-nine volumes of water, and one of the 

 same acid. Cold platinum positive 4J°. 



No. 17. A mixture of nineteen volumes of water, and one of the 

 same acid. Cold platinum positive 3J°. 



No. 18. A solution of 60 grs. of pure and partly dehydrated sodic 

 carbonate. Hot platinum positive 5J°. 



No. 19. A solution of pure and partly dehydrated potassic car- 

 bonate. Hot platinum positive 8°. 



No. 20. A solution of 120 grs. of crystalline sodic sulphate. Hot 

 platinum positive J°. 



No, 21. A solution of 120 grs. of ammonic nitrate. Hot platinum 

 positive |°. 



No. 22. A solution of 120 grs. of crystalline boracic acid. Hot 

 platinum faintly positive. 



No. 23. A solution of 120 grs. of sodic nitrate. Hot platinum 

 positive \° . 



No. 24. A solution of 120 grs. of crystalline phosphate of sodium. 

 Hot platinum positive 3°. 



No. 25. A solution of 60 grs. of baric nitrate. Hot platinum 

 positive 



No. 26. A solution of 60 grs. of crystalline nitrate of strontium. 

 Hot platinum positive 1°. 



No. 27. A solution of 120 grs. of crystalline phosphate of ammo- 

 nium. Hot platinum positive 6°. 



No. 28. A solution of 60 grs. of crystals of borax. Hot platinum 

 positive 2°. 



No. 29. A solution of 60 grs. of crystalline sodic hyposulphite. 

 Hot platinum positive 5^°. 



No. 30. A solution of 12 grs. of crystals of sodic sulphite. Hot 

 platinum positive 1°. 



No. 31. A solution of 60 grs. of the same salt. Hot platinum 

 positive 3J°. 



No. 32. A solution of 60 grs. of potassic sulphite. Hot platinum 

 positive 5°. 



No. 33. A solution of 60 grs. of crystalline phosphate of sodium 

 and ammonium. Hot platinum positive f°. 



No. 34. A solution of 120 grs. of the same salt. Hot platinum 

 positive 1°. 



No. 35. A solution of 60 grs. of formiate of sodium. Hot platinum 

 positive 4°. 



No. 36. A solution of 120 grs. of the same salt. Hot platinum 

 positive 5°. 



In a former research (" Proc. Roy. Sod.," vol. 27, No. 188, p. 513, 

 1878) with platinum electrodes, in which a different form of apparatus 

 was employed, but in which the solutions used were very much more 

 concentrated, the direction of the current was not affected by the 



