I 





228 



Analyfis of the Air, 



1 





( Fig. 35.) did in burning abforb much air ; J 

 and it was the fame with Antimony and 

 Brim ft one : Whence it is probable, that Vul- + 

 cano's, whofe fewel confift chiefly of Brim- ... 

 ftone, mix'd with fcveral mineral and me- 

 taline fubftances, do not generate, but rather 

 abforb air. 



We find in the foregoing Experiment 102 



on Nitre, that a great part of the new ge- 

 nerated air is in a few days reforbed, or 

 lofes its clafticity : But the air which is ab- 



forbed by burning Brim/ione, or the flame I 



of a Candle, decs not recover its clafticity 

 again, at lcaft, not while confined in my 

 glafTes. 



\ 





Experiment CV. 



I made fcveral attempts to try, whether 



air full of the fumes of burning Brim- 



ftone was as compreflible as common frefh 



air, by comprefTing at the fame time tubes 



full of each of thefe airs in the condenfmg 



engine j and I found that clear air is very *** 



little more compreflible, than air with fumes 



ofBrimftone in it : But 1 could not come to 



an cxaft certainty in the matter, becaufc the 



fumes 



I 



> 



11 



' 



