220 Analyfis of the Air, 



Experiment XCVI. 



'April 1 6th, A cubick inch of the afore- 

 mentioned Walton Tyrites powder'd, with 

 a cubick inch of compound Aqua-fortis, 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 35 cubick inches 

 of air. 



But the like quantity of the fame Mineral, 

 with equal quantities of compound Aquafor- 

 tis and Water y 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 effect. 



Yet oil of Vitriol and Water, with fome 

 of the fame Mineral, abforbed air. It was 

 very warm, but did not make a great ebul- 

 lition. 



Experiment XCVII. 



I chofe two equal ftzed boltheads 3 and 

 put into each of them a cubick inch of 



pow^ 



