216 



E. DIVERS ÀXD T. H AG A. 



droxyamine is less stable than when already formed. The consti- 

 tution of the dibarium salt is expressed by the formula — 



Barium oxyamidosulphonate, prepared by us, in solution first, as 

 already described in this paper, by adding just enough sulphuric acid 

 to the dibarium salt to remove half its barium. The neutral liquor 

 thus obtained yields by evaporation over sulphuric acid crystals 

 of the salt. It is a very soluble salt and forms small hard brilli- 

 ant square tabular crystals, intermixed with minute square prisms; 

 When long kept it decomposes. Its crystals contain water. Heated 

 nearly to 100°, it suddenly and violently decomposes into gases and 

 barium sulphate. 



In analysing it the barium was determined in one case by ig- 

 niting with sulphuric acid (a) ; in two cases the salt was slowly 

 heated with dry sodium carbonate, whereby oxygen was absorbed 

 from the air, after which the heat was raised to fusion of the mixture, 

 and the barium and sulphur both determined (î>) ; while in another 

 case, (he salt was hydrolysed by heating with hydrochloric acid, the 

 separated barium sulphate (representing all the barium and half the 

 sulphur of the salt) weighed, the other half of the sulphuric acid 

 precipitated with barium chloride, and lastly the hydroxyamine ti- 

 trated with iodine (c). The results were the following — 



