solvent Action of Muriate and Nitrate of Ammonia, 335 



gested in a cold saturated solution of muriate of ammonia 

 yielded, by filtration, a fluid abundantly precipitated of a black 

 coli)ur by hydro-sulphuret of ammonia. 



Oxide and Salts of Manganese. — The brown coloured hy- 

 drated deutoxide of manganese when digested in the ammo- 

 niacal salt yielded, by filtration, a fluid which was precipitated 

 by hydrosulphuret of ammonia, of the peculiar pale flesh- 

 colour characteristic of salts of manganese ; it is not impro- 

 bable, however, that the oxide operated upon, although ap- 

 J;)arently of a uniform brown colour, might have contained a 

 ittle protoxide which had not passed into the state of deut- 

 oxide by aerial exposure. Phosphate of manganese when 

 treated in the same manner yielded, by filtration, a fluid which 

 was similarly acted upon by hydrosulphuret of ammonia. 



Oxide and Salts ofCojypcr. — The hyd rated peroxide of cop- 

 per, the black anhydrous peroxide, and the carbonate of cop- 

 per, when digested in cold muriate of ammonia yield, by fil- 

 tration, a blue coloured fluid, evidently containing the metallic 

 oxide in some form of combination. 



Salts of Bismuth, — The subnitrate of bismuth of the shops, 

 when digested in a cold solution of muriate of ammonia or 

 boiled in the same salt did not yield, by filtration, a fluid which 

 yielded a black precipitate by hydrosulphuret of ammonia; 

 the same may be said of the salt when recently precipitated, well 

 washed and dried at the prevailing atmospheric temperature. 



The same applies to the protoxide and certain protosalts of 

 tiri. 



Salts of Silver. — The chloride, carbonate, and phosphate 

 when prepared without exposure to light, and digested in the 

 ammoniacal salt, without exposure to light also, yielded, by 

 filtration, a fluid v*hich was precipitated black by hydrosul- 

 phuret of ammonia. 



Persalts and Oxide of Mercury. — The peroxide, carbonate, 

 phosphate and bin iodide, when digested in a cold solution of 

 muriate of ammonia yield a fluid, which is abundantly preci- 

 pitated of a black colour by hydrosulphuret of ammonia. 



Some other metallic oxides and salts still remain to be 

 operated upon ; but as circumstances prevent me from car- 

 rying on the inquiry at the present moment, I must defer the 

 consideration of them to a future period. 



March 2, 1837- R. H. Brett, F.L.S. 



N.B. It will be observed that the results arrived at with 

 the salts of bismuth are different from those mentioned in 

 the former paper, p. 98; but it must be remembered that they 

 were operated upon under different circumstances as then 

 noticed. 



