Mowpittir 358 
‘secame indurated, and lost 1.45 grain; which we canclude te 
be the water contained in it. 
B. To the calcined mass (A) were added 300 grains af 
crystallized carbonate of soda, and the whole subjected to a 
high red heat, for one hour and a quarter. After cooling, 
distilled water was added and the temperature again raised 
to 212° Fahr. ; and the boiling was continued for some time. 
The whole contents of the crucible were then thrown upon a 
filter, and an insoluble residue (No. 1.) collected. The fil- 
tered solution having been necessarily left three or four days 
in a glass tumbler, the fluoric acid it contained, acted with 
, considerable energy upon the glass at the surface of the 
liquid, decidedly corroding it and destroying its polish. On 
adding an excess of acetic acid to this solution, a copious 
white precipitate (No. 2.) was thrown down with strong ef- 
fervescence. ‘This being collected on a filter, washed, and 
calcined, weighed 13.2 grains. It was soluble in diluted 
sulphuric acid, and the solution being mixed with sulphate of 
potash, afforded, on evaporation, octaedral and other crystals 
of alum, characterized by the peculiar taste of that salt, and 
thus proving the precipitate to be alumine. The liquor that 
remained after this second filtration, having acetic acid in 
excess, was heated with carbonate of ammonia, for silex, bu it 
gave no precipitate. It was again treated with acetic acid 
in excess, boiled to expel the carbonic acid, and treated with 
muriate of lime, which occasioned a white precipitate (No, 
_ III.) whose weight after washing and calcination, was 11.8 
grains. This was heated with sulphuric acid, and a glass 
Jaid over the crucible was deeply corroded; showing the 
precipitate to be fluate of lime. ‘Taking the proportions of 
fluoric acid and lime in fluate of lime, as stated by Berzelius, 
to be as 100 to 258.9, we obtain 4.56 grains for the quantity 
of fluoric acid in 50 grs. of the mineral under examination. 
This is probably less than the true quantity, as some of the. 
acid was lost by its action on the glass as above stated. 
C. The insoluble residue (B. No. I.) was digested for some 
time in a silver crucible, with pure muriatic acid and thrown 
upon a filter. The filtered solution was saturated with car. 
bonate of ammonia, which produced a precipitate (No. I,) 
whose weight, after calcination was 9.7 grains. The insolu- 
ble: gelatinous residue (No. IH.) remaining on the filter after 
the separation of the above solution, was digested with dis- 
tilled water, filtered, dried. and found to weigh 14.8 grairs, 
