502 Sir H. Davy’s further Experiments 
compounds with the metals, and that iodine has a greater 
tendency than chlorine to form triple compounds with oxygene 
and the metals. 
When in the case of the action of the chlorionic compound 
on fixed alkaline lixivia the chlorine is not in great excess, 
much iodine is always set free, because as it is easy to perceive 
from the proportions in which they combine, there is not suf- 
ficient oxygene detached from the alkali by chlorine to form 
the triple compound; and if the estimation of the composition 
of oxypotassame given in the first section be accurate, sup- 
posing that none of the double compound of iodine is formed, 
a solution must contain five proportions of chlorine to one of 
iodine, to produce a triple compound without the precipitation 
of iodine. It is however most probable that some double 
compound of iodine is always formed, as a solution must be 
extremely diluted indeed to contain five proportions of chlorine 
to one of iodine. 
When the solution of chlorionic acid is poured into solution 
of muriate of baryta, water must be decomposed to furnish 
hydrogene to the muriatic acid, and oxygene to the triple com- 
pound, and in this case some double compound of iodine 
and barium must be formed and remain dissolved in the 
solution. 
From the action of chlorionic acid on metallic solutions, I 
am inclined to believe that triple compounds of the common 
metals, oxygene and iodine may be formed by means of it. It 
occasions a copious precipitate without effervescence in the 
solution of sulphate of iron, and in the solutions of nitro- 
muriate of lead, and tin, and of nitrate of copper, and from 
analogy it is probable that these precipitates consist of the 
metal, oxygene, and iodine. 
