500 Sir H. Dawy*s further Experiments 
precipitation of substances having the characters of triple com- 
pounds or the oxyiocles. If it is coloured, or in its ordinary 
state, at the same time that the oxyiode is precipitated, much 
iodine appears, and it is impossible to render a concentrated 
solution colourless by agitation with chlorine, or to deprive it 
of its power of yielding iodine by acting on alkaline solutions. 
The chlorionic acid, when poured into a solution of muriate of 
baryta, causes a copious precipitate in it, which has all the 
characters of oxyiode of barium, and the liquor becomes very 
acid. 
When the colourless solution of chlorionic acid is added to 
a strong solution of ammonia, a white powder is precipitated 
which detonates feebly by a gentle heat ; and which, when 
decomposed in glass vessels, aflfbi*ds iodine and elastic matter 
which does not support combustion. 
When highly coloured chlorionic acid is employed, the 
powder that falls down is black, and detonates with much 
greater force, and by the slightest touch or motion, and it ap- 
pears to be the same substance as that procured directly by the 
action of iodine on ammonia, and which I have shewn to be a 
compound of azote and iodine. W^hether the white powder is 
a similar substance containing a larger proportion of azote, 
or whether it is a compound of ammonia with oxygene and 
iodine, or with iodine and chlorine, I have not yet been able to 
determine. 
It is soluble in excess of chlorionic acid, and in this way may 
be separated from the black powder; it affords a little moisture 
during its detonation, but it is not possible to say whether this 
is formed in the process, or w'hether it is water adhering to 
the compound, for the temperature of its decomposition is so 
