100 
ON THE IODIDES OF ARSENIC, 
son himself. It certainly insures a more perfect product, at a 
slight addition of labor. 
The formula for the sesquiodide is 
Asl 3 , and its atomic weight 454 
For the duo-semi qu'iodide, 
Asl 5 , atomic vyeight 706 
With the powers of these iodides, as remedial agents, I am 
unacquainted. 
In the Jlnnales de Chimie et de Physique, No. 39. pp 
265, 274, may be found an elaborate paper upon the compo- 
sition and analysis of the sesqu'iodide of arsenic, by M. Plis- 
son; to which, I would refer all those who may require more 
minute details upon these topics. 
New York, 22d May, 1841 
