ON THE IODIDES OF ARSENIC, 
97 
ART. XXII— ON THE IODIDES OF ARSENIC. 
By Henry F. Fish. 
In the Journal of Pharmacy for October, 1840, (which, ow- 
ing to an accident, did not reach me in the country until the 
last day of March, 1841,) I notice a few remarks upon Iodide 
of Arsenic, in a series of notices communicated by Mr. Au- 
gustine Duhamel. 
As Mr. DuhamePs notice of this salt, and its mode of 
preparation, is not ^sufficiently minute in detail j and as the 
tyro in chemical manipulation may be gratified by a few 
practical details, I hate concluded to submit the following 
paper. 
There are two iodides of arsenic. The first is a sesqu- 
iodide, consisting of 
Arsenic, 2 equivalents. 
Iodine, 3 " 
The second is a Duo-semi quiodide, (or per-iodide, as it 
is common to say,) consisting of 
Arsenic, 2 equiv. 
Iodine, 5 " 
My first essay in the preparation of these iodides was made 
in December, 1838. I had not, at that time, seen M. Plisson's 
paper upon the discovery and manufacture of the sesqu-iodide; 
and my only information was gained from Thomson's Che- 
mistry. 
I proceeded, however, using the moist way, with 
Pure arsenic. 
Iodine, 
Distilled water, 
3xx. 
gxxv 
3vj. 
VOL. VII, — NO. 11, 
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