132 Analysis of the Maryland Aerolite. 
matter fell down, which, together with a portion left after 
treating the dry mass with water, weighed 0°7 gr. at the 
common temperature. 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, which 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 ammonta, 
yielded a precipitate which after ignition weighed 0.1 gr. 
It appeared to be alumine contaminated with oxide of 
iron. 
Process 4.—The filtered solution, from which the first 
precipitate in the last process was separated, was boiled 5 
a gray earth fell down in flocks. The addition of potassa 
occasioned a farther deposite. On heating, it changed toa 
cinnamon-brown colour; dilute sulphuric acid, added in 
excess, dissolved it, with the exception of a brown residue, 
which weighed, after ignition, 0.2 gr. Before the blow- 
pipe, with borax and phosphoric salt, this brown matter 
yielded yellow beads—indicating nickel ? 
Process 5.—The sulphuric solution of the last process was 
évaporated to dryness, and heated further, to drive off the 
exeess 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, and 
subsequent precipitation by ammonia, yielded oxide of iron 
weighing 0.2 gr. 
Process 6.—The last watery solution was gently evapo- 
yated to a small compass ; sulphate of lime fell down during 
the evaporation. On leaving it to exhalation in the open 
air, sulphate of magnesia crystallized. These crystals, to- 
gether with the deposited sulphate of lime, were exposed 
to a dull red heat. The weight, while warm, was 9 grains. 
On adding a saturated solution of sulphate of lime, to dis- 
solve out the sulphate of magnesia, a portion was left, which 
weighed after ignition 1.1 grains. This subtracted from the 
weight of the mixed sulphates, leaves for sulphate of mag- 
nesia 7.9 grains. 
Process 7.—The precipitate, (process 3,) which had been 
digested in pure potassa, was re-dissolved in muriatic acid. 
