[ 89 J 
white fuffocating fumes pafied in great abundance ; what remained 
in the retort weighed 2 lbs. 1840 grs. and was concentrated to 
1,852, What came over appeared to be as {trong as what was at 
firft put into the retort. In thefe and other fimilar experiments, 
as is well obferved by Mr. Kirwan, the acid in the retort depofits a 
quantity of white powder, which appears to be gypfeous; this it 
lets fall in ftill greater quantity when diluted with water. What 
paffed over in the laft mentioned experiment, although very 
ftrong, was found to remain clear after dilution. Willing there- 
fore to try what degree of concentration this pure acid would 
admit, I fubjeéted it, together with the produ@ of many fimilar 
proceffes, to the aCtion of a ftrong fire. 
Grs. 
Thefe products weighed - - ~ 40380 
Came over - - - 10680 
Remained in retort - - E 29240 
Loft in vapours - - - 460 
Temperature 50. Specific gravity of what came over 
was - - - = - - 1,394 
Specific gravity of what remained in retort, and 
which bore dilution with diftilled water without 
having its tranfparency in the leaft difturbed, was - 1,846 
Vou. IV. N 
