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SELECTED ARTICLES. 
sulphuret of arsenic, an unequivocal solubility in ammonia. 
It is the same with the sulphuret of antimony obtained by the 
action of sulphuretted hydrogen on oxide of antimony, in 
combination; but here the solubility is not so great as appear- 
ances would lead us to believe. 
When a small quantity of sulphuretted hydrogen water is 
added to a solution of tartar emetic, a yellow color is produced 
which ammonia will not discharge. If a large quantity of the 
sulphuretted hydrogen be added, an orange colored precipitate 
is formed, and readily deposited as long as the sulphuretted 
hydrogen is not in excess; but, if the addition be continued, 
the greater part of the sulphuret of antimony will be very 
slowly deposited and remain as if in suspension in the liquid. 
If the ammonia be added to the supernatant liquor, it will 
instantaneously render it clear and transparent; but here it is 
not the ammonia alone which dissolves the sulphuret, but it is 
the hydrosulphuret of ammonia, resulting from the union of 
the ammonia with the excess of the sulphuretted hydrogen. 
If the sulphuretted hydrogen, which is deposited, be washed 
several times in water, and then placed in ammonia, it dis- 
solves in a notable quantity. The ammonia does not change 
color, but when exposed to the air, or saturated by an acid, it 
deposits the sulphuret which it held in solution. 
The bi-sulphuret is soluble in ammonia, and the solution is 
yellow. 
The per-sulphuret dissolves largely in ammonia, and the so- 
lution is likewise yellow. Exposed to heat it is decom- 
posed into sulphur, and sulphuret of antimony. We do not 
know whether this sulphuret should be considered as a parti- 
cular combination, or whether it is a mixture of sulphur with 
bi-sulphuret of antimony. 
Jour, de Pharm. 
