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284 





Analyfis of the Air. 



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fulphur in its Analyfis is found to contain 

 an inflammable oil, an acid Salt, a very fixt 

 earth, and a little metal. 



Now fulphur and air are fuppofcd to be 

 aaed by that ethereal medium, « by which 

 " (the great Sir Ifaac Newton fuppofes) 

 " light is refraded and refleded, and by 

 " whofe vibrations light communicates heat 



to bodies, and is put into fits of eafic 

 " reflexion, and eafie tranfmiilion : And 



do not the vibrations of this medium 



in hot bodies contribute to the intenfe- 

 " nefs and duration of their heat? And do 

 ". not hot bodies communicate their heat 



to contiguous cold ones, by the vibra. 



tions of this medium, propagated from 

 «? them into cold ones? And is not this 



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medium exceedingly more rare and fub- 

 tle than the air, and exceedingly more 

 « claftick and aclive ? And does it not rca- 



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dily pervade all bodies, Qptkk qu. 18. 

 The elaftick force of this medium, in 

 proportion to its denfity, muit be above 

 490,000,000,000 times greater than the 

 elaftick force of the air is, in propor- 

 tion to its denfity, ibid. qu. 21." A force 

 fufficient to give an intenfe degree of heat, 



3 cfpecially 



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