1879.] Aqueous Solutions ivith Mercurial Electrodes. 477 



No. 28. A solution of 50 grs. of crystals of borax. Hot mercury 

 positive 10-J°. Stirring A increased the deflection to 22, and stirring B 

 increased it to 15. 



No. 29. A solution of 50 grs. of crystalline sodic hyposulphite. 

 Cold mercury positive 4°. Stirring A decreased the deflection to 

 3, and stirring B had no effect. 



No. 30. A solution of 10 grs. of crystals of sodic sulphite. Hot 

 mercury positive 2^°. Stirring A increased the deflection to 5, 

 and stirring B had no effect. 



No. Si. A solution of 50 grs. of the same salt. Hot mercury 

 positive 13°. Stirring A increased the deflection to 15, and stirring B 

 Lad no effect. 



No. 32. A solution of 50 grs. of potassic sulphite. Cold mercury 

 positive 9°. Stirring A increased the deflection to 13, and stirring B 

 made hot mercury positive 12°. 



No. 33. A solution of 50 grs. of crystalline phosphate of sodium 

 and ammonium. Hot mercury positive 5°. Stirring A increased 

 the deflection to 9, and stirring B increased it to 7. 



No. 34. A solution of 100 grs. of the same salt. Hot mercury 

 positive 2°. Stirring A increased the deflection to 4, and stirring B 

 had no effect. 



No. 35. A solution of 50 grs. of formiate of sodium. Hot mercury 

 positive 4°. Stirring A increased the deflection to 20, and stirring B 

 increased it to 10. 



No. 36. A solution of 100 grs. of the same salt. Hot mercury 

 positive 6°. Stirring A increased the deflection to 10, and stirring B 

 increased it to 11. 



By arranging the foregoing results in a series with the solution at 

 the top, in which the hot mercury was the most positive at 180° F., 

 and that at the bottom in which it was most negative, the following 

 order was obtained. The horizontal line separates those liquids in 

 which the hot metal was positive from those in which it was negative. 



Amount of deflection. 



1. Phosphate of ammonium 28 + 



2. Carbonate of sodium 19*0 



3. Sulphite of sodium (50 grs.) 13 - 



4. Sulphate of ammonium 12*75 



5. Carbonate of potassium 1 12 '0 



6. Sulphate of potassium / 12*0 



7. Borax 10'5 



8. Nitrate of potassium 1 10*0 



9. .Nitrate of strontium J 10*0 



10. Selenate of sodium 1 8*0 



11. Phosphate of sodium J 8*0 



