32 T. S. Hunt on a new Titaniferous Mineral. 
cipitation of yttria, which it was thought might be present; the 
filtrate was evaporated to a small bulk, feebly acidulated by hy- 
’ drochloric acid, and oxalic acid was added. This gave no precip- 
itate, even aftet the nope of several eR: vie was Perce 
absent. 
A portion of the mineral deca swith. carbonate of ‘ole 
and dissolved in hydrochloric acid ; sulphuretted hydrogen passed 
through the solution on no precipitate, proving: the aban 
of tin. 
Having determines that the only: sibetintes present were Kailien: 
and titanic acids, with iron, magnesia, alumina, water and traces 
of lime, I proceeded to determine their proportions. 
- Quantitative Analysis.—1. A. One gramme of the quthiieal 
presiously dried at 250° Fahr. and cooled in a dessiccater, was 
mixed with sulphuric acid in a platinum.crucible ; heat was ap- 
plied and the digestion continued for half an hour; the whole 
was then allowed to cool, when water being added, a white residue - 
remained. The fluid was carefully decanted off, and more sul- 
phuric acid added, it was then heated till the acid began. to be 
volatilized, cooled and the soluble parts removed by water ; this 
process was repeated five times; the ee which was ssilicie 
= weighed = -185. grammes. ' 
_B. The solution was mixed with tartare seid: end a ndbonia in 
Oe a a 
excess ; the iron by sulphuret of ammonium, ° 
and wher: converted into peroxide, it weighed -130 grammes. 
2. A. Five decigrammes of the dried mineral treated as above, 
gave ‘(095 grammes ; which when treated with carbonate of soda, 
left a little titanic acid. 
_B. The solution was piocip stated by ammonia veil the precip- 
itate redissolved in the smallest quantity of dilute sulphuric acid, 
the solution being largely diluted with water and. boiled for some 
time, adding water occasionally to supply the loss by evaporation. 
It is difficult to precipitate titanic acid by ebullition when the 
solution contains a large excess of sulphuric acid, but if the 
quantity*of the solvent acid is small, the titanic acid is spain 
thrown down. - 
_ After four hours of ebullition, the solution was filtered and the 
htanie acid washed with a dilute solution of sulphate of ammo- 
a ane “ignited ; the crust which obstinately adhered to the glass, 
} removed by a few drops of sulphuric acid, with the aid of 
