from the RIVER DEE. 261 



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 fleam-bath, weighed 53 

 grains, and pofTefled the properties of oxide of titanium. 



2. The liquid thus freed from titanium, was evaporated to 

 drynefs, and the refidue redifTolved in water, acidulated with 

 muriatic acid. A white powder remained, which, after being 

 heated to rednefs, weighed 16.8 grains, and pollened 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- 

 am. The whole was then thrown on a filter, to feparate the 

 undiflolved 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 by the magnet, and weighed 52 grains. 



5. It was digefted in diluted fulphuric acid ', but not being 

 rapidly a&ed upon, a quantity of muriatic acid was added, and 

 the digeflion continued. The whole flowly difTolved, except a 

 blackifh 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. The acid folution being concentrated by gentle evaporation, 

 a number of fmall yellowifh-coloured needles made their ap- 



K k 2 pearance 



