[ n6 ] 



its natural Jftate was reallv an ai? 

 approaching in quality to common 

 air ; and that the heat of the ebul- 

 lition had changed this very air into 

 phlogifticated air, in the fame way 

 as the acl: of fermentation changes 

 it into fixed air, the light of the fun 

 into fine dephlogifticated air, the 

 digeftion in the ftomach and the 

 interlines of an animal (a great deal 

 of the air contained in the inteftines, 

 and all that from which we eafe 

 ourfelves by the rectum, is pure 

 inflammable air) and actual fire ap- 

 plied to it into inflammable air, and 

 the ohfcurity of the night into an- 

 other kind of truly poifonous air ? 

 Could it be faid with any degree of 

 probability, that one and the fame 

 vegetable contains thefe fix kinds 

 of air, lb different in their nature, 

 and even contrary to one another ? 



