compound of iodine and oxygene. 209 
By liquid muriatic acid, the substance is immediately decom- 
posed, and the compound of chlorine and iodine is formed. 
When boracic acid was added to a solution of the new 
compound, it dissolved in it by heat, and did not crystallize 
on cooling By evaporation, a solid white substance was 
procured, not so easily decomposed by heat as the compound 
itself. 
The taste of all these acid compounds is very sour, though 
in different degrees of intensity: they redden vegetable blues, 
and they dissolve gold and platinum. When they are made to 
act on the alkalies or earths, or on saline solutions which they 
are capable of decomposing, common neutral salts and oxy- 
iodes are formed at the same time. 
The facts of the combination of the new compound with 
acids, serve to explain the phenomena of the action of these 
substances, on the oxyiodes which I have described in my last 
paper on iodine, and they confirm the opinions there stated 
on the nature of this action. The substance procured by 
M. Gay Lussac, by the action of sulphuric acid on the solution 
of the oxyiode of barium, and which he has supposed to be a 
pure combination of oxygene and iodine mixed with a little sul- 
phuric acid, has evidently for its base the combination just now 
described of sulphuric acid and the new compound, and, as I 
have shown, it likewise contains baryta. However minute 
the quantity of sulphuric acid made to act on oxyiode of barium, 
a part of it is always employed to form the compound acid ; 
and the residual fluid contains both the compound acid, and 
a certain quantity of the original salt. 
That this compound acid is a true chemical combination, 
is evident from the observations already detailed, and from 
mdcccxv. E e 
