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Analjfis of the Air. 
! 
Experiment XCVI. 
April 1 6th, A cubick inch of the afore- 
mentioned Walton pyrites powder’d, with 
a cubick inch of compound Aqua-fortiSy ex- 
panded with great violence heat and fume 
into a fpace equal to 200 cubick inches, and 
in a little time it condenfed into its former 
fpace, and then abforbed' 85 cubick inches 
of air. 
But the like quantity of the fame Mineral 
with equal quantities of compound Aqua for- 
tis and Water, fermented more violently, 
and generated above 80 cubick inches of air. 
I repeated thefe Experiments feveral times, 
both with and without water, and found 
conftantly the fame effeft. 
Yet oil of Vitriol and Water, with fomc 
of the fame Mineral, abforbed air. It was 
very warm, but did not make a great ebul- 
lition. 
Experiment XCVII. 
I chofe two equal lized boltheads, and 
put into each of them a cubick inch of 
pow: 
