10 ART. 15,-TAMEMASA HAGA. 



quantities of apparently secondary products) when the salt is heated 

 to boiling with enough water to dissolve it, and in presence of 

 sufficient alkali to prevent both the acidification of the solution 

 during the decomposition of the salt and also the secondary changes 

 which would result from acidification. The alkali does not appear to 

 modify the nature of the primary change, although it distinctly 

 increases the stability of the salt, as already mentioned (p. 14). 

 When carried out in the foregoing manner, the decomposition of a 

 peroxylaminesulphonate proceeds largely in such a way that not only 

 do three-fourths of the sulphur of the salt, as suggested by Claus and 

 by Jîaschig, together with one-half of its nitrogen, come out as 

 hydroxylaminetrisulphonate, but the rest of the sulphur and one- 

 fourth of the nitrogen become hydroxylaminedisulphonate again, 

 whilst the remaining one-fourth of the nitrogen appears as nitrite, 



2(S0 3 K) 4 N 2 2 +H 2 0=2(S0 3 K) 3 NO+(S0 3 K) 2 NOH+N0 2 H, 

 although some nitrous oxide and sulphate, besides minute and uncer- 

 tain quantities of other substances, are always produced (p. 20) 



This result explains the production of the large quantities of 

 acid sulphate and nitrous oxide observed by Claus and Raschig, for 

 the nitrous acid when not neutralised by alkali interacts with the 

 hydroxylaminedisulphonate and yields acid sulphate and nitrous 

 oxide (this Journ., 13, 212.) 



The generation of hydroxylaminedisulphonate in the spon- 

 taneous decomposition of a peroxylaminesulphonate accounts for the 

 fact, met with in the present investigation, that much more hydroxyl- 

 aminetrisulphonate is obtainable by heating hydroxylaminedisulphon- 

 ate in solution with excess of lead peroxide than can be derived 

 from the decomposition (out of contact with lead peroxide) of the 

 peroxylaminesulphonate equivalent to that quantity of hydroxylamine- 

 disulphonate (p. 5). For in presence of lead peroxide, that hydroxyl- 



