from the RIFER DEE. 255 



its weight of carbonate of potafh, and expofed for two hours to 

 a red heat, in a porcelain crucible. The mafs, being foftened 

 in water, was digefied in muriatic acid. By repeating this 

 procefs twice, the whole was difTolved in muriatic acid, ex- 

 cept a brownifh-white matter, which being dried in the open 

 air, weighed 19 j grains. 



2. The muriatic acid folution, which had a deep yellowifh- 

 brown colour, was concentrated almoil to drynefs, and then di- 

 luted with water. It aflumed a milky appearance ) but nothing 

 was precipitated. Being boiled for fome time, and then fet 

 aiide, a curdy-like matter fell. It was of a milk-white colour, 

 weighed, when dry, 7 grains, and pollened the properties of 

 oxide of titanium. 



3. The refidual liquid being fuperfaturated with ammonia, a 

 dark reddifh-brown matter precipitated, which being feparated 

 by the filter, dried, drenched in oil, and heated to rednefs, af- 

 fumed the appearance of a black matter, ftrongly attracted 

 by the magnet. It weighed 93.7 grains, and was oxide of 

 iron. 



4. The 19.5 grains of refidual powder, being mixed with 

 four times its weight of carbonate of foda, and expofed for two 

 hours to a red heat, in a platinum crucible, and afterwards 

 heated with muriatic acid, was all difTolved, except about a 

 grain of blackifh matter, which was fet afide. 



5. The muriatic folution being concentrated by evaporation, 

 a little white matter was feparated. It weighed ^th of a grain, 

 and pofTeffed the chara&ers of oxide of titanium. 



6. When 



