Ae 
pic ; 
’ This is probably less than the true ceaeeieyye 
igelte 
ae 
- — Topaz. 335 
became indurated, and mt eiresze ad which we wepatie. to 
be the water containe - 
B. To the calcined mass (A) were adducts 300 grains. ee 
crystallized carbonate of soda, and the —_— subjected toa 
high red heat, for one hour and a qua After cooling, 
distilled water was added and the amaea 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- 
bese — having been necessarily left three or four days 
a glass | r, the fluoric acid it contained, acted with 
iderable sorte upon the glass at the surface of the 
uid, corroding it and destroying its polish. On 
ing 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, wash 
calcined, weighed 13.2 grains. It was soluble in diluted 
acid, and the solution vt mixed with sulphate of 
: -afforctendy on evaporation, octaedral and other erystals 
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, 
HIE.) whose weight after auton and calcination, was 11.8 
rains. This was heated with su 05 pret 
wi 
_— ac 
to be as 100 pane we obtain 4.56 erains 
of fluoric acid in 50 : 
acid was lost by its action on the glass as Shot: ened 
©—C. The insoluble residue (B. No. 1.) was digested for some 
time. jn 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, 1.) 
whose weight, after calcination was 9.7 grains. ‘The insolu- 
ble gelatinous residue (No. Hl.) remaining on the filter after 
‘the separation of the above solution, was digested with dis- 
tilled water, filtered. dried, and fiend to weigh 14,8 grains. 
