HYDROCYANIC ACID. 
241 
a light deposit of prussian blue (when the product is rich in 
ferrocyanate, the blue deposit is very abundant.) 
The deutosulphate of copper also added to a part of the 
above liquid, forms a chesnut brown precipitate, or only pro- 
duces a reddish tint which gradually gives place to a light 
precipitate. 
ADDITI ON. 
I have also succeeded in transforming cyanuret of silver 
into sulphocyanuret, which furnishes an accessory proof. The 
following process has been followed: the cyanuret was mixed 
with one-half its weight of washed sulphur, then heated in a 
small tube of glass, until fusion took place, (which was pretty 
rapid). The residue, when triturated, was treated with a so- 
lution of common salt, and then filtered; it gave 
1. A more or less decided crimson red colour with the 
muriate of the peroxide of iron. 
2. A whitish deposit, with the deutosulphate of copper 
when a little protosulphate of iron was added. 
Journal de Pharmacie. 
