ADULTERATION OF IODINE OF POTASSIUM. 
217 
water-bath, and then treated with acetic acid, which pro- 
duced a flocculent brown precipitate, from which boiling 
acetic acid removed coagulated vegetable albumen, leaving 
a residue of pectine. 
According to the experiments of the author, the centra! 
bark of Sambucus nigra contains viburnic acid, traces of 
an essential oil, vegetable albumen, a neutral resin, an acid 
sulphurous fat, wax, chlorophylle, tannic acid, grape-sugar, 
gum, extractive, starch, pectine, malate of potash, malate of 
lime, sulphate of potash and lime, chloride of potassium 
phosphate of magnesia, lime, silica, and peroxide of iron. — 
Chem Gaz., from Archiv der Pharm. 
ART. XLV. — ADULTERATION OF IODIDE OF POTASSIUM BY 
MEANS OF THE BROMIDE j THE MEANS OF DETERMINING 
THE AMOUNT OF THE LATTER IN THE COMPOUND. 
By M. Personne. 
The adulteration of iodide of potassium by the bromide 
of the same base, being a known fact, we thought it would 
be useful to publish the following process, by means of 
which we can not only ascertain the presence of these two 
products in the compound, but also determine the relative 
proportions of each. 
When we treat a solution of iodide of potassium with 
sulphate of copper, we know that a protoiodide of copper 
is immediately precipitated, and that consequently half the 
iodine of the iodide remains in solution, notwithstanding 
the excess of sulphate that has been added. 
M. Duflos has shown that we can precipitate the whole 
of the iodine in the solution in the state of protoiodide of 
