54 



ANALYSIS OF MAGNETIC IRON-ORE. 



through the filter, so that the milky matter cannot 

 be separated. But by spontaneous evaporation, a 

 small quantity of whitish matter was procured ; 

 which, after being heated to redness, became in- 

 soluble, though it gave out a little iron when digest- 

 ed in muriatic acid. It was heated to redness with 

 four times its weight of carbonate of potash. The 

 mass was then digested in water. By this means, 

 a white powder was obtained. This white pow- 

 der dissolved in muriatic acid. The solution was 

 yellow, and, when treated with reagents, exhibit^ 

 ed the following appearances : 



1. With infusion of galls, a reddish brown pre- 

 cipitate fell. 



2. Prussiate of potash. A blue precipitate, 

 which hecanie white when a little ammonia was 

 added. 



3. Hydrosulphuret of ammonia. A dark green 

 precipitate in flocks. 



4. Ammonia. 1 A white flocky preci- 



5. Carbonate of soda. J pitate. 



6*. Phosphate of soda. 1 A white flocky preci-- 



7. Arsejiiate of potash. X pitate. 



8. Oxalate of ammonia. 1^^ ^^^^^^^ 

 g. Tartrate of potash. J 



From these experiments it follows, that the sub- 

 stance was white oxide of titanium, not quite fre^ 

 from ixon. 



