FROM BURDWAN. 177 



8. — To separate the oxides of manganese and iron, boil them in a 

 solution of muriate of ammonia, with a little sugar, the whole of the man- 

 ganese will be dissolved, and the iron left, (it has been ascertained by 

 independent experiment, that no oxide of iron is taken up, and prussiate 

 of potass will satisfy the chemist that it is manganese) : precipitate the 

 manganese by water of ammonia cautiously added, and filter ; if the liquid 

 has any colour, a portion of the oxide has been re-dissolved by the excess 

 of ammonia, and will precipitate on allowing it to evaporate ; when the 

 liquor is perfectly limpid, the Avhole has been obtained, and may be col- 

 lected as usual: — This is Mr. Faraday's process for their separation. 



X. 



