29S ON THE PREPARATION OF THE IODIDE OP LEAD. 
agent of crime remains in those parts where it has produced 
its pathologic or mortal effects. 
The author also proposes the use of weak acids, mixed 
with chlorides or alkaline hypochlorites, as antidotes to 
morphine, narcotine and brucine. The vegetable acids 
have been considered as counter-poisons to opium and the 
vegetable alkalies in general. Chemically speaking, the 
dilute vegetable acids are very powerful solvents of the 
proximate principles, as morphine, narcotine and brucine. 
Are they not counter-poisons merely because they meet 
with alkaline chlorides in the economy ? As necessary 
adjuvants to these acids, it would then be very useful to 
conjoin the special chlorinated compounds which have been 
mentioned. These theoretical inductions must however be 
confirmed by experience. — Chem. Gaz., from Comptes 
Jtendus. 
ART. LXXVIII. — ON THE PREPARATION OF THE IODIDE OF 
LEAD. 
By M. Boudet. 
When iodide of lead is prepared by precipitating acetate 
of lead by iodide of potassium, a certain quantity of iodide 
of lead always remains dissolved in the liquid. Lepaire, 
who long since drew attention to the fact, states that this 
remainder of iodide of lead may be precipitated by the ad- 
dition of a few drops of nitric acid, while basic acetate of 
lead sends down tribasic iodide of lead, and sulphuric and 
muriatic acids liberate iodine. On evaporating the liquid, it 
leaves, according to Lepaire, a white residue, which on 
treatment with water again deposits protiodide of lead. 
