136 Chemistry and Chemical Arts. 
We are convinced from these experiments, that a dose of the hy- 
drated oxide of iron, corresponding to two or four drachms of the ox- 
ide of iron, mingled with sixteen drops of ammonia, is sufficient to 
convert eight or ten grains of well pulverized arsenic acid, into this 
insoluble salt which we have mentioned. Besides, it 1s easy to per- 
ceive that in a case of poisoning from arsenic, these substances may 
be employed in much larger doses, with or without the ammonia, in 
drink, or by injections, since the hydrated oxide of iron, bemg a 
substance insoluble in water, exercises no action upon the animal or- 
ganization.— Bib. Univer. Aout. 1834. 
10. Titanium one of the constituent principles of most primitive 
rocks.—M. Prscuier comes to this conclusion, from having detec- 
ted the presence of this metal in four varieties of Feldspar, in the 
proportion of from 12. to 3.25 percent, and in three kinds of Ser- 
pentine, from 8. to 5.25 per cent. He also finds 15.50 of Titanium 
in the Andalusite. 
11. Volatibility of Titanium, by M. Zinxen. (Ann. de Pog., 
t. 28.)—Having heated a large quantity of titanium obtaimed from 
the high furnaces of iron works, in a double crucible, in the heat of 
a furnace for melting steel, during several hours, the crucibles were 
found broken, but their interior was coated with metallic titanium, 
while the crystals had wholly disappeared. 
12. Preparation of Iodic Acid. (J.de Pharm., t. 19, p. 222.)— 
It is easy to obtain Iodic acid on the large scale, by the following 
process: put one part of recently precipitated iodine into a matrass 
with a long neck, to which a long tube of about two lines diameter 
is fitted, make a mixture of eight parts of nitric acid with one and a 
half to two parts nitrous acid, and pour upon the icdine enough of 
the mixture to dissolve half or two thirds; afterwards apply a mild 
heat and gently agitate the vessel to throw down the icdme which. 
has condensed upon its neck: after a few minutes add a new dose 
of acid, and proceed in this way until all the iodine has disappear- 
ed. Then pour the whole into a capsule of porcelain and the iodic 
acid is deposited. But it will be yellow, and in order to have it 
perfectly white, it must be dissolved in distilled water, filtered, evap- 
orated, and when sufficiently concentrated, add to it, once or twice 
its volume of pure and fuming nitric acid, in order to precipitate the 
