106 Mr. G. Chilton’s Analysis of the Maryland Aérolite. 
pitate had been separated, had a wine-yellow colour, thereby 
affording a suspicion that it contained more metal. _Neutrali- 
zation and heat were both tried without effecting a further se- 
paration. Hydro-sulphuret of ammonia threw down a black 
precipitate. This precipitate heated, redissolved in nitric acid, 
and precipitated by potash, gave another apple-green preci- 
pitate, which ignited, weighed 0:2 gr. The solution being 
still a little coloured, was again treated with hydrosulphuret 
of ammonia, redissolved in nitric acid, and precipitated by 
potash. By this treatment another precipitate was obtained, 
which weighed 0:1 grain. 
Process 10.—Twenty grains of the same unmagnetical aéro- 
lite were mixed with an equal weight of nitre, and heated in 
a bright red heat. On dissolving out the matter of the cru- 
cible and neutralizing the solution, it neither produced a yel- 
low with nitrate of lead, nor a red with nitrate of mercury— 
hence it contained no chrome. 
From the 25 grains there were obtained by these processes, 
14°6 + 0°3 so silica, 2)... +... 14090 
7°9 sulph. mag. = magnesia. - 2°60 
1°1 sulph, lime =lime . ..«' 0°46 
3°9 + 0:2 + 2°0 + 0°5= oxide of iron. 6°15 
0'2 + 0°3 + O'2 + 0-1 = oxide of nickel 0°80 
sulphur): 3). 9°27 
alumina. . 0°05 
26°12 
It would seem superfluous to remark, that the increase of 
weight in this, and the following analysis, must be accounted 
for from the change of condition of the iron with respect to 
oxygen. 
Examination of the magnetical Portion of the Maryland 
Aérolite. 
Process 1.—Twenty-five grains exposed to the action of 
nitro-muriatic acid left, by the usual management, 3 grains of 
silica, after ignition. 
Process 2.— Ammonia, added to excess, threw down from 
the acid solution oxide of iron, which weighed, after ignition, 
24 grains. 
Process 3.—Tothe ammoniacal solution, which had a blueish- 
green tinge, potash wasadded. On the application of heat a por- 
tion of earthy matter precipitated, too trifling for examination. 
Hydro-sulphuret of ammonia threw down a black precipitate, 
which, heated, redissolved in nitric acid, and precipitated by 
potash, 
