compound of iodine and oxygene. all 
euchlorine on iodine, in which the iodine was in great excess, 
the solid substance formed had a chocolate tint; but this may 
possibly have depended upon a small quantity of free iodine, 
and when dissolved in water, it afforded by the evaporation 
of the water, the white compound only. 
I detailed in my last paper on iodine, some unsuccessful 
attempts to procure a compound of oxygene and iodine from 
the chlorionic acid, the substance produced by the agency of 
the combination of iodine and chlorine in water, on the idea 
that water was decomposed in this experiment. I have made 
some further researches, on the supposition that it might 
contain a compound of iodine containing less oxygene than 
this new substance ; but without any success : neither by dis- 
tillation at very low temperatures, nor by the action of small 
quantities of oxide of silver, nor by any other means, have I 
been able to separate any compound of oxygene from it; 
and when it forms triple compounds, the oxyiodes, by its action 
upon alkalies, or earths, or metallic solutions, it appears that 
the oxygene of the alkalies or earths is only newly combined 
at the moment of its operation upon them, an effect assisted 
by the attraction of the bases of the earths for chlorine. The 
conclusion which I formed, that the chlorionic acid is a simple 
combination of the chlorionic sublimate in water, is still far- 
ther proved by the circumstances of the action of muriatic 
acid on the new solid compound of oxygene and iodine.* 
Page 209. 
* The chlorionic acid offers an easy method of procuring pure baryta. By dropping 
a solution of it into solution of muriate of barium, as I have shown in my last paper 
on iodine, a precipitate of oxyiode of barium is produced, which when decomposed by 
a strong heat, yields pure baryta, the attraction of oxygene for barium being, as I have 
stated, stronger at this temperature than that of iodine, 
E e 2 
