Analyfis of the Air. izt 

 powdered Walton 'Pyrites, with only a cu- 

 bick inch of compound Aquafortis into one, 

 and a cubick inch of Water and compound 

 Aquafortis into the other : Upon weighing 

 all the ingredients and veffeis exa&ly, both 

 before and after the fermentation, I found 

 the bolthead with compound Aquafortis alone 

 had loft in fumes i dram 5 grains : But the 

 other bolthead with Water and compound 

 Aquafortis, which fumed much more, had 

 loft 7 drams, 1 fcruple, 7 grains, which is 

 fix times as much as the other loft. 



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 1 8 cubick inches of air 5 and in 3 

 days more it remitted and generated 12 cu- 

 bick inches of air ; and on pouring warm 

 water into the veffel x x (Fig. 34.) it re- 

 mitted all that had been abforbed. 



Equal quantities of Brimflone and com- 

 pound Aquafortis neither generated nor 

 abforbed any air, notwithftanding hot wfr 

 ter was poured into the veifel x x> 



g A cu : 



