40 H. ROSE ON THE COMBINATIONS OF THE 
1°170 gramme of the combination prepared at another time 
gave, treated in the same way, 1052 gramme of chloride of silver, 
and 1-733 sulphate of barytes, which corresponds to 22°18 chlo- 
rine and 20°44 per cent. sulphur, agreeing therefore both with 
the results of the first analysis, and also with the calculated 
composition. 
The compound is constituted exactly as might be expected, 
@ priori, from what has been previously stated. If the chlo- 
ride of sulphur (S Cl’) could be prepared in its isolated state, it 
would, as is highly probable, and has already been observed, take 
up so much ammonia, that when the combination was treated 
with water, it might be considered as a combination of chloride 
of ammonium and of sulphate of the oxide of ammonium, or 
more correctly perhaps of sulphat-ammon. In this case 1 atom 
of the chloride has 4 double atoms of ammonia. Since now 
the 5 atoms of anhydrous sulphuric acid, which are contained 
in 1 atom of the sulphate of the chloride of sulphur, take up 5 
double atoms of ammonia to form sulphat-ammon, 1 atom of 
the sulphate of the chloride of sulphur must combine with 9 
double atoms of ammonia. 
Regnault * has examined the combination of ammonia with 
a sulphate of the chloride of sulphur first prepared by him, 
which, like the chromate of the chloride of chromium, consists 
of 2 atoms of sulphuric acid and 1 atom of the chloride of sul- 
phur, SCP + 2 S. He found that this compound takes up 6 
double atoms of ammonia, which likewise is exactly the quantity 
which, @ priori, might be admitted in its ammoniacal combina- 
tion. In other respects it is essentially different from the one 
I had previously prepared, in so far as it deliquesces when ex- 
posed to the atmosphere, which is not the case with the other. 
But Regnault neither regards the sulphate of the chloride of 
sulphur, nor its combination with ammonia, in the same manner 
as we have done in this memoir: Owing to the theory of substi- 
tution advanced by Dumas, and the views which Walter and 
Persoz have started on the constitution of the chromate of the 
chloride of chromium and similar compounds, he looks upon the 
combination, S CP? + 2 S, as a sulphuric acid in which one-third 
of the oxygen is replaced by chlorine, and therefore as S Cl. 
* Annales de Chimie et de Physique, t. \xix. p. 176. 
