from the RIVER DEE. 264 
pearance of the yolk of an egg. It was boiled, diluted with 
water, and fet afide for fome time. A white matter gradually 
depofited, which, when dried on the fteam-bath, weighed 53 
grains, and poffefled the properties of oxide of titanium. 
2. THE liquid thus freed from titanium, was evaporated to 
drynefs, and the refidue rediffolved in water, acidulated with 
muriatic acid. A white powder remained, which, after being 
heated to rednefs, weighed 16.8 grains, and poffeffed the pro- 
perties of filica. 
3. THE folution was precipitated by ammonia, and the brown 
matter which had feparated, boiled for fome time in liquid pot- 
afh. The whole was then thrown on a filter, to feparate the 
undiffolved part, and the liquid which came through, was mix- 
ed with a folution of fal ammoniac. A white powder fell, 
which, after being heated to rednefs, weighed 3.2 grains. It 
was alumina. ; 
4. THE brown fubftance collected on the filter, was dried, 
drenched in oil, and heated to rednefs. It was ftrongly attract- 
ed LBy the magnet, and weighed 52 grains. 
_ gs. Ir was digefted in diluted fulphuric. acid; but not being 
rapidly acted upon, a quantity of muriatic acid was added, and 
the digeftion continued. . The whole flowly diflolved, except a 
blackith matter, which became white when expofed to a red 
heat, , and, as far as I could judge from its properties, was oxide 
of titanium, flightly contaminated with iron. It weighed 1.8 
grains. 
6. Tue acid folution being concentrated by gentle evaporation, 
a number of fmall yellowifh-coloured needles made their ap- 
Kk2 . pearance 
