184 Mr. J. Davy’s Account of some Experiments on the 
clear filtered muriat, and fusion of the residue procured by 
evaporation. Indeed, I think this a good general method for 
purifying manganese from iron. One of the combinations of 
the latter metal and chlorine being volatile, heat must sepa- 
rate it from the compound of manganese. And I have thus 
obtained it so free from iron, that triple prussiat of potash 
added to its solution in water, gave merely a white precipitate 
without the slightest tint of blue. 
This compound deliquesces when exposed to the atmo- 
sphere, and is converted into the white muriat. Like ferrane, 
it affords a trifling residue when heated with water. The re- 
sidue is oxide of manganese, white at first, but soon becoming 
red, and even black ; it varies in quantity, according to the 
exclusion of air in the formation of the combination. 
50 grains of the compound dissolved in water, with the ex- 
ception of 1 grain ; this residue was separated by decantation 
of the fluid, washed, dried, and heated to redness, it was in 
the state of black oxide. The colourless solution was preci- 
pitated by nitrat of silver. The horn silver formed, when 
dried, was equal to 108 grains. Hence, omitting the 1 grain 
of mixed oxide, 100 of this compound appear to consist of 
54 chlorine 
4 6 manganese 
100 
The horn lead that I have analysed, was made by the de- 
composition of the nitrat of lead by muriatic add, and it was 
well washed, dried, and fused in a glass tube with a small 
orifice. The strongest red heat that I could apply to it, under 
these circumstances, did not occasion its sublimation. 
