OX OXYAMIDOSÜLPHONATES. 215 



honh(so 3 k),oh 2 a h b 



Potassium 23.08 22.53* 23.45 



Sulphur 7.58 7.34 7.69 7.56 



Oxyamidogen, HOXH. 18.94 17.96 19.76 17.50 



Water 10.39 9.29 



Sample a was in prisms, and b in tabular crystals. We have 

 given much consideration to Claus's apparently carefully obtained 

 results, but are unable to öfter any explanation of their difference 

 from ours. We have prepared the salt in winter and in summer 

 (when he found it difficult to work), by evaporation of cold solutions 

 and by cooling hot solutions, and have always obtained crystals 

 which slowly effloresced in the desiccator. 



Dibarium oxyamidosulplionate, prepared by Fremy and by us, is 

 a crystalline, alkaline, nearly insoluble salt. It dissolves in hydro- 

 chloric acid, and then shows by the odour evolved, the presence of 

 sulphite, from a trace only to even much, as an impurity. The only 

 analytical datum given by Fremy is that the salt is formed from one 

 equivalent of acid and two equivalents of baryta. AVe have analysed 

 it and found for it a composition agreeing with the formula given by 

 Fremy less the Ho by which his formulae generally exceed those now 

 adopted. 



In this analysis and that of the following salt we slightly modi- 

 lied the method of hydrolysing, so as to get uniform and higher 

 numbers for the hydroxyamine. The modification consisted in 

 heating for some time with hydrochloric acid only to 100", before 

 raising the temperature to 130". Simple hydroxyammonium sul- 

 phate may be rapidly heated with acid to 130° or even higher with- 

 out getting low results, from which it would appear that at the 

 moment of its formation at 130° from its sulphonic derivative, hy- 



* Slight loss of potassium sulphate during cooling known to have occurred. 



