

dhalyjh of the Air. 



2R3 



But by many of the preceding Experi- 

 ments, it is evident, that the matter loft 

 in the Analyfis of thefe bodies was claf- 

 tick air, a very aftivc principle in fire, 

 but not an elemental fire, as he fuppofes. 



" Mr. Geoffrey compounded fulphur of 

 « acid Salt, Bitumen, a little Earth and oil 

 « of Tartar." Mem. de I' Acad. Anno 1703. 

 In which oil of Tartar there is much air by 

 Experiment 74, which air was doubtlefs by 

 its elafticity very inftrumental in the inflam- 

 mability of this artificial fulphur. 



If fire was a particular diftincl: kind of body 

 inherent in fulphur, as Mr. Homberg, Mr. 

 Lemery, and fome others imagin, then fuch 

 fulphureous bodies, when ignited, mould 

 ratify and dilate all the circumambient air < 

 whereas it is found by many of the preced- 

 ing Experiments, that acid fulphureous fuel 

 constantly attracts and condenfes a confide- 

 rable part of the circumambient elattick air. 

 An argument, that there is no fire endued 

 with peculiar properties inherent in fulphur ; 

 and alfo that the heat of fire confifts prin- 

 cipally in the brisk vibrating adion and re- 

 adion, between the elaftick repelling air, 



and the ftrongly attracting acid fulphur,which 



fulphur 











' 







I 





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