2 AET. 15, -TAME M ASA H AG A. 



with those of 5/6-normal potassium hydroximinosulphate, and 



the two salts can hardly be separated by crystallisation. Its solution 

 is quite neutral and gives a precipitate with basic lead acetate only. 

 Fremy expressed the composition of the sulphazilate by the formula, 

 HO NS 2 K 2 (here written with the atomic proportions now in use), 

 which is only incorrect in including hydrogen (Claus). He gave the 

 composition of the metasulphazilate correctly as HgO^XoSglv 



Clans (Annalen, 1871, 158, 205) who gave details for the prepara- 

 tion of the coloured salt by lead peroxide, proved that in its pro- 

 duction from 5/6-normal potassium hydroximinosulphate it is 

 not necessarily accompanied by sulphate; he also demonstrated 

 with tolerable certainty that it is the sole product of the oxidation ; 

 and found that it passed spontaneously into the colourless salt, to- 

 gether with a fixed quantity of sulphate and a gas which is apparently 

 nitrous oxide (compare page 1 G of this paper). He recognised the 

 sulphonate constitution of both salts and gave to the coloured salt 



the name and formula, 'oxysulphazotate,' (S0 3 K) 3 X^ — jf\(S0 3 K), 



and to the white salt the name and formula, 'trisulphoxyazoate,' 

 0:N(S0 3 K) 3 , H 2 0, that is, with the nitrogen quinquevalent in both 

 formulae. It will be seen that, even empirically these formulae differ 

 a little from Fremy's. Claus also sought for, and, as he believed, 

 obtained the primordial sulphazotised salt, which he formulated at first 

 as SCX,,NCUv (op. cit., 213), and afterwards as G:N(S0 3 K) (Ber., 1871, 

 4,508). This would be the analogue of the 'trisulphoxyazoate,' only 

 with the nitrogen trivalent; but the existence of this salt has since 

 been disproved (this Journ., 1900, 13, 21!)). 



Raschig (Annalen, 1887, 241, 223) having found that the white 

 salt, in a boiling and feebly acid solution, may yield sulphate to the 

 extent of two- thirds of its sulphur, along with, apparently, hydroxyami- 

 nosulphuric (hydroxylaminemonosulphonic) acid, has recognised that 



