218 E. DIVERS AND T. HAGA : 



analysis it was only air-dried on the tile ; in the desiccator it 

 would prohably have lost its 3 per cent, of water (^SOHo) and 

 then approached in composition Fremy's sulphazite. 



A second double salt, SKNOo, K5H (NSo07)2, OH2, was got by 

 dissolving one mol. 5/6 normal salt and 1.4 mol. potassium hy- 

 droxide in a hot 65 per cent, nitrite solution and cooling. In 

 appearance it resembled the other compound salt. Its analysis 

 gave : — 



Potssm. Sulphur Alk. potssm. 



Found, 36.17 15.07 4.51 per cent. 



Calc, 36.81 15.06 4.61 



A third double salt, anhydrous, 7KNO2, 3K5H(NSo07)2, was 

 not prepared synthetically but by treating an almost saturated 

 solution of the nitrite with alkali and sulphur dioxide, and ad- 

 ding alkali again after the sul phonation, imitating a process of 

 Fremy's. Then, filtering the heated solution from much crys- 

 talline 5/6 normal hydroximidosulphate mixed with a little of its 

 combination wnth nitrite, we got the mother-liquor, when quite 

 cold, almost filled with tiny j^risms of a compound answering to 

 the above formula : — 



Potssm. Sulphur Alk. potssm. 



Found, 36.94 16.37 4.96 per cent. 



Calc, 36.99 16.51 5.05 



This salt was quickly resolved by water into nitrite and 



