Analysis of the Maryland Aeroiiie. 133 
Ammonia added in excess threw down oxide of iron, which 
after ignition, weighed 3.9 grains. 
Process 8.—The last ammoniacal solution, which had a 
bluish green colour, was evaporated to dryness. After the 
further application of heat, to volatilize the ammoniacal salt, 
a residue was left of a dark brown colour, which, on solu- 
tion in nitric acid and precipitation by potassa, gave a bulky 
apple-green precipitate, which turned to a dark-brown by 
heating it to ignition. It weighed 0.3 gr. 
Process 9.-—The liquor, from which the apple-green pre- 
cipitate had been separated, had a wine-yellow colour, there- 
by affording a suspicion that it contained more metal. Neu- 
tralization and heat were both tried without effecting a fur- 
ther separation. Hydro-sulphuret of ammoniathrew down a 
black precipitate. ‘This precipitate heated, re-dissolved in 
nitric acid, and precipitated by potassa, gave another apple- 
green precipitate, which, ignited, weighed 0.2 gr. The 
solution, being still a little coloured, was again treated with 
hydro-sulphuret of ammonia, re-dissolved in nitric acid, and 
precipitated by potassa. By this treatment another pre- 
cipitate was obtained which weighed 0.1 grain. 
Process 10.—20 grains of the same unmagnetical zrolite 
were mixed with an equal weight of nitre, and heated ina 
bright red heat. On dissolving out the matter of the cruci- 
ble, and neutralizing the solution, it neither produced a yel- 
low with nitrate of lead, nora red with nitrate of mercury— 
hence it contained no chrome. 
From the 25 grains there were obtained by these pro- 
CeSess 
14°6+0.3 =Silica 14,90 
7.9 Sulph. Mag. =Magnesia 2.60 
1.1 Sulph. Lime =Lime 0.45 
3,.9+0.2+2.0+0.5—Oxideoflron 6.15 
0,2-+-0.3-+4-0.2-+0,1=Oxide of Nickel 0.80 
Sulphur 1.27 
Alumine 0.05 
26.12 
It would seem superfluous to remark, that the increase o1 
weight in this, and the following analysis, must be accounted 
for from the change of condition of the iron, with respect to 
oxygen. 
