Analysis of an Hydrate of Irons 299 
lected on a filter and after a strong calcination weighed 
2.25 grammes. It was then calcined with caustic potash 
in a silver crucible, no cameleon having been formed, 
Manganese was not present, the mass was treated with 
water, the solution being of a light brilliant yellow color, 
indicated a trace of oxide of chrome. The residue, which 
was not dissolved by the potash, being separated from the 
solution, and again acted on by the alkali, was found free 
from Alumina and Phosphoric acid. This residue was 
dissolved in muriatic acid, the solution was supersaturated 
with ammonia, the filtered liquor was tested for lime, 
with oxalate of potash, but none was detected ; therefore, 
the residue was peroxide of iron, it weighed 2.11 grs. on 
3 grs., or 70.333 per 100. 
The alcaline liquor was supersaturated with muriatic 
acid, after ebullition it was treated with caustic ammonia, 
there was formed a precipitate of phosphate of Alumina, 
weighing 0.05 grs., or 1-666 per 100. 
After the separation of the phosphate of alumina, the 
liquor was treated with muriate of lime, the phosphate of 
lime thus formed weighed 0.145 grs., equivalent to 0.0806 
grs. of phosphoric acid on 3 grs., or 2.686 per 100. 
D. The hquor (C) from which the precipitate by the 
subcarbonate of ammonia was separated, was tested suc- 
cessively with oxalate of potash and phosphate of soda and 
ammonia, but neither lime nor magnesia was present. 
The constituents of this iron ore are, per 100 parts. 
A. Water, 19.833 
B. Argile, Be333 
C. Peroxide of Iron, 70.333 
C. Phosphate of Alumina, 1.666 
C. Phosphoric Acid, 2.686 which combines with 
(1.936 of oxide of iron. 
97.851 4 
100.000 
2.149 
