PEROXYLAMINESULPHONATES AND HYDROXYLAMINETRI8ULPHONATES. 27 



accordance with the equation, the actual numbers should have been 

 33*33 and 66*67 per cant, respectively. By other experiments it 

 was, however, established that .sonic of the aminedisulphonate was 

 precipitated with the sulphate. No doubt, also, some barium 

 chloride was carried down. 



Potassium hydroxylaminetrisulphonate, 1*441 grams, was 

 reduced by sodium amalgam, and the solution neutralised and pre- 

 cipitated in the cold by barium chloride as above described. The 

 washed precipitate was then heated for four hours at 150° with 

 dilute hydrochloric acid in a sealed tube. The acid was nearly 

 neutralised, and the barium sulphate collected, washed, and 

 weighed as usual. The filtrate from this yielded a fresh precipitate 

 with barium chloride, for the barium aminedisulphonate, which 

 was precipitated with the sulphate, had been hydrolysed into 

 barium sulphate and ammonium hydrogen sulphate. There- 

 fore, from the weight of the main precipitate of sulphate was 

 deducted that of the small quantity last obtained, and the 

 remainder taken as sulphate actually produced by the sodium 

 reduction. It amounted to the equivalent of 34"20 per cent, of the 

 total sulphur. The aminedisulphonate in the original filtrate from 

 crude sulphate was determined by hydrolysing and weighing its 

 sulphur as sulphate. To the weight of this was added twice that of 

 the barium sulphate obtained, as just described, from the soluble 

 sulphate extracted by hydrolysing the crude barium sulphate, because 

 twice that quantity represented the total sulphur of the aminedisul- 

 phonate precipitated along with the sulphate. This sum was 

 equivalent to 05*75 per cent, of the total sulphur. That 

 these data still deviate from the calculated numbers is no doubt 

 due to the adsorption of a little barium chloride to the sulphate when 

 precipitated in the cold. The barium of this chloride will have 



