232 METHOD OF PREPARING CORROSIVE SUBLIMATE. 
ART. LXVI.— ON A SIMPLE METHOD OF PREPARING COR- 
ROSIVE SUBLIMATE. 
By. Drs. A. and C. Walter. 
The authors propose turning to account the property 
which chlorine-water possesses of converting calomel into 
corrosive sublimate, for the preparation of the latter. Ac- 
cording to the method which they describe, calomel is pre- 
pared from the protonitrate of mercury and chloride of 
sodium, and is then placed in several separate vessels, as in 
the preparation of chlorate of potash, each of which must 
be capable of containing, without being quite filled, 8 parts 
of water for every 1 part of calomel placed in it. The gas 
is first passed through a washing trough, and then succes- 
sively through all the vessels, until the whole is converted 
into a clear solution. The filtered solution is then evapo- 
rated and set aside to crystallize. Even with calomel, 
which had not been recently precipitated, the process 
proved perfectly successful. It would be highly advan- 
tageous if hot water could be employed instead of cold, and 
the vessels, with the exception of the last, heated upon a 
sand-bath ; only 4 times the quantity of water would then 
be required, and a great part of .the evaporation would 
be spared. Calomel may also be rubbed to a paste 
with water, and chlorine passed into it, when it also fur- 
nishes corrosive sublimate in the form of a crystalline pow- 
der.— Chem. Gaz.from Buck. Rep. 
