’ $76 Miscellanies. 
a syrup, and then formed into a ball, with sufficient oil, and, if neces- 
sary, a little charcoal. This being put into a crucible lined with 
charcoal, and that placed in another, containing powdered charcoal, 
and the whole heated well for about an hour, will yield the metal 
chromium. 
21. On the Acidification of Iodine by means of Nitric Acid; by 
Artuur Conneti, Esq. A. M.—The methods which have been 
hitherto followed for the oxidation of iodine with a view to the form- 
ation of iodic acid, may apparently be reduced to three: first, The 
action of alkaline solutions, giving rise to the formation of a hydriodate 
and an iodate, from the latter of which the iodic acid may be sepa- 
rated by the original method of M. Gay-Lussac, and more perfectly 
by the recent processes of M. Serullas ;* secondly, The action of 
euchlorine, as suggested by Sir H. Davy; and, thirdly, The action 
of water on the perchloride of iodine, and subsequent separation of 
iodic acid by means of alcohol, as also proposed by M. Serullas.t 
The agency of nitric acid, under certain management, offers another 
method, which I have been unable to observe noticed any where, and 
which, perhaps, will be found to equal in facility of execution any of 
the preceding processes. 
This agency may be advantageously studied on the small 
If a little iodine be boiled with a small quantity of nitric acid ina 
common test tube about five inches long, the iodine is dissolved, and 
a red solution formed. If the liquid be now farther boiled, and the 
orifice of the tube kept slightly stopped with a piece of cork, the 
iodine sublimes, and condenses on the sides of the tube. The iodine 
_ is then to be washed back again into the liquid by agitation 5 the liquid 
again boiled, and the sublimed iodine again washed back into the 
fluid ; and this process is to be contirued until no iodine any longet 
appears, and the liquid is colorless. If the boiling be then continued 
for a little, so as to increase the concentration of the liquid, it usually 
becomes milky ; and if it be poured out and evaporated to dryness, 
a white mass is left, which is iodic acid, retaining a little nitric acid. 
Having made shese observations on the small scale, I po 
to try the process with larger quartities of the materials, with (ot 
to its employment as.a method for the preparation of jodic acid. +H€ 
scale. 
* Annales de Chimie et de Physique, xliii. 127 and 217. | Ibid. xlv. 63: 
