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XXIV. Further Experiments and Observations on Iodine. By 
Sir H. Davy, LL. D. F. R. S. V. P. R. /. 
Read June 16, 1814. 
1. On the triple Compounds containing Iodine and Oxygene. 
1. In this communication I shall have the honour of pre- 
senting to the Royal Society, a continuation of the inquiries I 
have made respecting the chemical agencies of iodine, and the 
properties of certain of its compounds. 
2. I described in my last paper the action of iodine on fixed 
alkaline lixivia, and the deflagrating salts it forms. In the first 
experiment which I made on these compounds, I employed 
the first crystals which fall down from moderately strong 
solutions of potassa and soda saturated with iodine, which had 
been purified by being repeatedly acted upon by distilled 
water : I now find that this process is not sufficient to free the 
triple compound from the double compound ; and that to obtain 
them in a state of absolute purity, it is necessary to boil them 
repeatedly in small quantities of alcohol of specific gravity of 
from 8.6 to 9.2, which dissolves the double compound, but 
has little power of action on the triple compound. 
The triple compounds, when purified, present some curious 
chemical phenomena, which a minute quantity of the double 
compound adhering to the crystals that I operated upon, 
prevented me from observing in the experiments I have 
already communicated to the Society. I shall describe these 
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