a 
ceses 
Analysis of the Maryland Aeroiiie, 133 
Ammonia added in excess rae down oxide of i iron, which 
after ignition. weighed 3.9 grains. 
Process 8.—The last ranvscksal solution, whieh had a 
bluish green colour, was evaporated to dryness. After the 
further application of heat, to volatilize the ammoniacal salt, 
a residue was Jeft 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 
etd 7 be ees It weighed 0.3 gr. 
.--The liquor, from which the apple-green i 
eipitats re been separated, had a wine yellow colour, ther 
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 aeated, re-dissolved in 
nitric acid, and precipiteted by potassa, por another apple- 
grees: precipitate, which, ignited, weighed 0.2 gr. 
solution, being still a little coloured, was again treated sith 
hydi -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 erolite 
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, — ved with nitrate of pass 
heace-it contained no 
‘From the 25 grains there were obtained by. these: pro: 
hi. 3 =Silica 14.90 E 
7.9 Sulph. Mag. =Magnesia 2.60 — 
1.1 Sulph. Lime =Lime 0.45 
3.9-+0.2+2.0+0.5=Oxide of Iron 6.15 
0.2+0.3-+0.2+0,1=Oxide of Nickel 0.80 
Sulphur ¥.27 
Alumine 0.05 
: ee 
It would seem supéiions to remark, that the increase oi 
weight in this, and ibe following analysis, must be accounted 
for from the change of condition of the iron, with respect to 
oX ygen. 
