St Analysis of the Maryland Aerolite. 
Examination of the magnetical portion of the Maryland 
; . Aerolite. * 
Process 1.—25 grains exposed to the action of nitro-muri- 
atic 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 igni- 
tion, 24 grains. ; 
Process 3.—TFo the ammoniacal, which had a bluish-green 
tinge, potassa was added. On the application of heat a por- 
tion of earthy matter precipitated, too trifling for examina- 
tion. Hydro-sulphuret of ammonia threw down a black 
precipitate, which, heated, re-dissolved in nitric acid, and 
precipitated by potassa, yielded an olive-green precipitate, 
which ignited weighed 1.70 gr. and had a light-brown 
colour. ‘ 
a. Nitric acid added to this precipitate, did not dissolve 
the whole of it. Muriatic acid was added without effectin 
a complete solution. The mixture was heated and evapo- 
rated nearly to dryness. On standing till the next day it 
formed a gelatinous mass of a green colour. Water was 
added, and the insoluble portion separated by the 
filter. It weighed 5 grains, and had a gray colour. 
b. Ammonia was added to the nitro-muriatic solution (a.) 
in excess, which re-produced the bluish-green tinge. By 
evaporation to dryness, and exposure to a red heat for some 
time, the ammoniacal salts were volatilized, and a yellowish 
brown oxide left. 
c. Before the blowpipe, with borax and phosphoric salt, 
beads were produced of a brown colour, and opaque when 
the oxide was in considerable proportion to the salt, but 
when diluted with more salt, blood-red globules formed, 
which changed on cooling, to hyacinth-red, and when en- 
tirely cold had a fine yellow, with, in some instances, a 
slightly reddish cast. The undissolved portion produced the 
same appearances, nearly, but less distinctly. Regarding, 
therefore, the precipitate 1.70, in process 3, as oxide 0 
nickel contaminated with siliceous earth, perhaps 1.25 may 
be put down for oxide of nickel ; we shall then have, as the 
result of analysis of the magnetic zrolite, 
