Analyfis of the Air. 22 j 
powdered Walton Tyrites , with only a cu- 
bick inch of compound Aquafortis into one, 
and a cubick inch of Water and compound 
Aqua-fortis into the other: Upon weighing 
all the ingredients and veflels exactly, both 
before and after the fermentation, I found 
the bolthead with compound Aquafortis a- 
lone had loft in fumes 1 dram 5 grains: But 
the other bolthead with Water and com- 
pound Aquafortis y which fumed much 
more, had loft 7 drams, 1 fcruple, 7 grains* 
which is fix times as much as the other lofb 
Experiment XCVIIL 
A cubick inch of Newcaftle Coal pow- 
dered, and an equal quantity of compound 
Aquafortis poured on it, did in 3 days 
abforb 18 cubick inches of air* and in 3 
days more it remitted and generated iz cu- 
bick inches of air 5 and on pouring warm 
Water into the vefiel x x, (Fig, 34.) it re- 
mitted all that had been abforbed. 
Equal quantities of Brimftone and com- 
pound Aquafortis neither generated nor ab- 
forbed any air, notwithftanding hot Water 
was poured into the veflel x x. 
A cubick inch of finely powdered Flint , 
and an equal quantity of compound Aqua - 
Q, fortiSy 
