4 ART. 2. — E. DIVERS AND T. HAGA. 



charring paper in contact with it. We have already published 

 (this Journal, 1900, 13, 307) our success in sulphonating ammo- 

 nium nitrite into hydroximidosulphate by a method, which carried 

 farther, gave Fremy the nitrilosulphates. 



Ammonium nitrilosulphate has the interest attached to it of 

 being one more compound of ammonia with sulphur trioxide to 

 be added to those recognised. There are six such compounds: — 



(1) NH 3 , 2S0 3 = HN(S0 3 H) 2 



(2) NH 3 , S0 3 = PLN SO3H 



(3) 4NH ;! , 3SO :: = N(S0 3 NH.,), 



(4) 3NH 3 , 2S0 3 = HN(S0 3 NH 4 ) 2 



(5) 4NH,„ 2S0 3 = (NH 4 )N(S0 3 NH 4 ) 2 



(6) 2NH 3 , S0 3 = H 2 NS0 3 NH 4 . 



Of these the second is amidosulphuric acid and the sixth its am- 

 monium salt (this Journal, 1896, 9, 219) ; the first imidosulphuric 

 acid, known only in unstable solution (this Journal, 1894, 6, 51) ; 

 the fourth is its 2 / 3 -normal ammonium salt (parasulphatammon of 

 Rose) ; and the fifth, polymeric with the sixth, is its normal 

 ammonium salt (sulphatammon of Rose ; this Journal, 1894, 6, 

 53) ; and the third is ammonium nitrilosulphate here described. 

 These six compounds can all be derived the one from the other, 

 backwards as well as forwards, except the nitrilosulphate which 

 cannot be re- Formed from the others although itself the most 

 convenient source of them. Nitrilosulphuric acid would he the 

 seventh of these compounds, heading the column as NH 3 , 3S< >, ; , 

 if it could exist in the free state. 



Potassium salt. 



The potassium salt, N(S0 3 K) 3 , 20IL, is familiar to those who 

 have occupied themselves with the study of Fremy's sulphazotiscd 

 salts, being one of the most insoluble of potassium salts, even 



