222 E. DIVERS AND T. HAGA : 



tically prepared compounds of nitrite and hydroximidosulpliates. 

 Diliydroxylamine salts have as yet only a hypothetical existence 

 and are likely to remain so. For the double linking of the 

 oxygen atom with the tervalent or quinquevalent nitrogen atom 

 seems always experimentally to make or break itself in a single 

 act, notwithstanding its bipartite character. 



Kaschig in his researches on Fremy's sulphazotised salts got, 

 besides those we have just discussed, two other salts of undeter- 

 mined constitution, both of which were most probably also 

 nitrito-hydroxiraidosulphates. They may therefore be noticed 

 here although Kaschig did not represent them to be dihydroxyl- 

 amine derivatives. Yet they were evidently closel}^ like the 

 other two in properties. One was isomeric with potassium liypo- 

 nitrososulphate (Pelouze's salt) and also with his (K^ to S) ' dihy- 

 droxylamine ' salt, allowing for different hydration, and the other 

 was isomeric with potassium Ö/6 normal hydroximidosulphate. 

 Each could be obtained but once and they only call for any 

 detailed notice because of the theoretical imj)ortance given to 

 them as isomerides of other salts. The first referred to above 

 was mistaken by Raschig for Pelouze's salt (hyponitrososul- 

 phate) but that salt it certainly was not (this Journal, 9, 85). 

 It was got by dissolving nitric oxide in solution of potassium 

 sulphite and hydroxide and evaporating to a small volume till 

 crusts formed. If we assume that air or nitric peroxide was not 

 excluded there were the conditions present for getting a nitrito- 

 hydroximidosulphate, for, as we show in a paper which will 

 shortly follow this, nitrous fumes passed into potassium sulphite 



