Mr. G. Chilton’s Analysis of the Maryland Aérolite. 105 
Process 3.—Bi-carbonate of potash was added to the solu- 
tion, which was heated a little. The precipitate was separated 
by the filter, washed and digested in pure potash. The caustic 
liquor, drawn off by the syphon, super-saturated with muriatic 
acid, and treated with carbonate of ammonia, yielded a pre- 
cipitate which after ignition weighed 0-1 gr. It appeared to 
be alumina contaminated with oxide of iron. 
Process 4.—The filtered solution, from which the first pre- 
cipitate in the last process was separated, was boiled; a gray 
earth fell down in flocks. The addition of potash occasioned 
a further deposit. On heating, it changed to a cinnamon- 
brown colour; dilute sulphuric acid, added in excess, dis- 
solved it, with the exception of a brown residue, which weighed 
after ignition 0°2 gr. Before the blowpipe, with borax and 
phosphoric salt, this brown matter yielded yellow beads—in- 
dicating nickel ? 
Process 5.—The sulphuric solution of the last process was 
evaporated to dryness, and heated further to drive off the ex- 
cess of acid. On adding water, a part only dissolved: on 
adding more water, the whole dissolved, except a portion of 
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 evaporated 
to a small compass; sulphate of lime fell down during the 
evaporation. On leaving it to exhalation in the open air, sul- 
phate of magnesia crystallized. These crystals, together 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 dissolve out the sul- 
phate of magnesia, a portion was left, which weighed after 
ignition 1*1 grain. This subtracted from the weight of the 
mixed sulphates, leaves for sulphate of magnesia 7°9 grains. 
Process 7.—The precipitate (Process 3), which had been 
digested in pure potassa, was redissolved in muriatic acid. 
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 
blueish 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 solution 
in nitric acid and precipitation by potassa, give a bulky apple- 
green precipitate, which turned to a dark-brown by heating 
it to ignition. It weighed 0:3 ger. 
Process 9.—The liquor, from which the apple-green preci- 
Vol. 67. No. 334, Feb. 1826. O pitate 
