Analysis of the Maryland 4erolite. 131 
and the power necessary for its successful ‘operation, are not 
greater than is required by power Jennies doing the same 
work. A frame of 300 spindles will spin 300 runs, 1600 
yards to the run, per day, and will with ease turn off 100 Ibs. 
offourrun yarn in twelve hours. Two girls of sixteen years 
a age, will attend a three hundred — frame one on each 
Art. XVIII.—Analysis of the Maryland Aerolite. By 
Georce Cutton, Lectarer on Chemistry, &c.* 
Tue piece of Maryland zrolite subjected to examination, 
weighed 228.30 grains in air, and lost 62,25 grains by im- 
mersion in water, at 60° temperature. Its specific gravity is 
therefore, 3.66. The external crust was taken off, and the 
remainder powdered, not very finely, and separated into two 
parts by the magnet ; 40 grains were obedient to the magnet, 
25 of which were taken for examination. The same quan- 
tity was taken of the unmagnetical portion. 
Feomianiop 2 the smmpagpetical portion of the Maryland 
erolite. 
Process 1.—The 25 grains were digested in dilute nitric 
acid; an undissolved part floated, which, together with the 
solution, was decanted from a heavier part, which remained 
at the bottom of the flask. To this last, muriatic acid was 
added, and digestion continued till every thing soluble was 
taken up. The two insoluble parts managed in : 
way, and carefully dried, weighed 15.87 grains. ng 
sure to a red heat, ina crucible, sulphur burnt off with 
its usual oe flame, and left siliceous earth which weighed 
14.6 
Proces: nae 2,—The acid solutions were mixed together and 
cuaperaial slowly to cat ; during which nortan” of 
* a of the fall af this erolite was grams our last number, 
1. IX. p.351. For a more particular di scription of the stone 
and ie illustrative remarks respecting it, see the end of thts paper.—-En, 
