WITH CARBONATE OF POTASSA. 137 
5 of Robiquet's iodide (No. 1) were dissolved in 100 
grammes of distilled water. 
5-0 of the doubtful iodide (No. 2) were likewise dissolved 
in. 100 grammes of distilled water. This solution was slight- 
ly opalescent. 
Both solutions were heated by a solution of acetate of 
lead, until cessation of precipitate. To No. 2, dilute nitric 
acid was added to remove the carbonate of lead formed, 
and in order to put the two precipitates in the same condi- 
tion, nitric acid was likewise added to No. 1. 
Both precipitates of iodide of lead were well washed 
with cold distilled water, and thrown on niters, dried and 
weighed. The following was the result obtained : — 
• No. 1 gave 6-62. No. 2, 5-18. 
Thus— 6-62 : 5-00 : : 5-18 : 3-91. 
Or nearly 22 per cent, of carbonate of potassa, and only 
78 of iodide of potassium, an enormous adulteration, and so 
much the more reprehensible as it is a medicine on which 
medical practitioners ought to be able to depend, and which 
is administered only in small doses. 
The results obtained by M. Rivaud, by different means, 
are very nearly the same. 
I beg you to be kind enough to insert this note in an early 
No. of the Journal de Pharmacie, — Ibid from ibid. 
