Pharmaceutical Notices. 
283 
other alternative remains for us, but to take such measures as 
may be in our power, to exhibit our agency in the business, 
and to exculpate ourselves from the imputation of an adulte- 
ration of the article, or of vending the same, knowing it to be 
bad. 
We shall accordingly at the next stated meeting of the 
College of Pharmacy, make application for the appointment 
of a special committee of investigation — before whom we 
pledge ourselves to lay the whole matter open, leaving it for 
them to place the censure upon those that merit it. 
ART. LVIII. PHARMACEUTICAL NOTICES.— No. XIL 
Hydriodate of Ammonia. — Having been occasionally called 
upon for a new preparation — viz. : the combination of hy- 
driodic acid, with ammonia, I send for the Journal, the pro- 
cess usually adopted in its preparation. There are two modes 
by which the same result may be attained, either by direct 
combination of the acid with ammonia, or by the decompo- 
tion of hydriodate of iron. By the former process, the salt 
is said to be white when first prepared, but speedily chang- 
ing to yellow. The latter is the formula which I have used, 
and which is to be preferred as more simple and less expen- 
sive. The product of it has uniformly been of a pale yellow 
colour. It is prepared as follows: — 
Take of solution of proto-iodide of iron, or hydriodate of 
protoxide of iron, prepared according to the formula pub- 
lished in Vol. 4, p. 287, of this Journal, Q. S. Add to it a solution 
of fresh carbonate of ammonia, in small quantities at a time, 
as long as any precipitate of carbonate of iron falls. Then 
carefully separate the carbonate of iron by filtration, and 
evaporate the clear liquor which contains in solution, the hy- 
