310 
A NEW ANTIDOTE FOR CORROSIVE SUBLIMATE. 
This antidote is not restricted in its effects to the soluble 
compounds of mercury — it serves also to destroy the inju- 
rious action of many other metallic salts, and particularly 
those of copper and lead. 
To prepare the protosulphuret of iron, any quantity of pure 
protosulphate of iron is to be dissolved in at least twenty-four 
times its weight of distilled water, which has been boiled to 
drive off any atmospheric air; this solution is to be precipi- 
tated by a sufficient quantity of protosulphuret of sodium, 
likewise dissolved in boiled distilled water. The protosul- 
phuret of iron thus formed is to be washed with pure water, 
and preserved for use in a closely stopped bottle, which is 
to be completely filled with distilled water. 
Although the protosulphuret of iron may be made in a few 
moments, it is nevertheless proper that it should be kept 
ready prepared, to avoid the loss of any precious moments in 
a case of poisoning. 
The direction to preserve this sulphuret from contact of 
the air should be very strictly followed, as this compound has 
a strong tendency to pass to the state of sulphate. 
Journ. de Pharm. and Chim. 
