132 Analysis of the Maryland Aerolites 
matter fell ein which, together with a portion left after 
treating the dry mass with water, weighed 0°7 gr at the 
eommon lancet: -On further examination, they proved 
to be silica and oxide of iron. By estimation, 0.3 silica, and 
0.2 oxide of iron, in the perfectly dried state. 
Process 3.—Bi-carbonate of potassa was added to the 
solution, whieh was heated a little. The precipitate was 
separated by the filter, washed and digested in. pure potassa. 
The caustic liquor. drawn off by the syphon, super-saturated — 
with muriatic acid, and treated with carbonate of ammonia, 
yielded a preeipitate which after ignition weighed 0.1 gr. 
It appeared to be alumine contaminated with oxide of 
iron 
Process 4.—The ae solution, from which the first 
occasioned a farther deposite. On heating, it fchenied roe a 
cinnamon-brown colour; dilute sulphuric a‘, added i 
éxcess, dissolved it, with the exception of a brown sei dit 
which weighed, after ignition, 0.2 gr. Before the blow- 
pipe, with borax and phosphoric as this brown: matter 
yielded Mite beads—indicatin yA: 
Process 5.—The sulphuric solution ef the last process was 
evaporated to drymess, and heated further, to drive off the 
excess of acid. On adding water, a part only dissolved ; 
on adding more water, the whole dissolved, except a portion 
ef a brown colour, which by solution in muriatic acid, aid 
subsequent Saget by ammonia, yielded oxide of iron 
Seis 6 
Process 6. 2 The last watery solution was gentl : 
5 hg apo 
ed to a small compass ; sulphate of lime fell down during 
es! ‘the evaporation. Op leaving it to exhalation in the open 
ir, sulphate of magnesia crystallized. These crystals, to- 
1er with the deposited sulphate of lime, were exposed 
lull red heat. The weight, while warm, ‘was iaodee 
out out the sulphate of magnesia, a portion was left, w 
ed after ignition 1.f grains. This subtracted from the 
t of the mixed sulphates, leaves for sulphate of mag~- 
Besia 7.9 grains. 
Process 7.— The pre cipitate, (process 3.). which had been 
digested | in pure seen was re-dissol yed in muriatic acid. 
