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Analyfis of the Atr. 2yp 



as the putting of fulphurcous mixtures into 

 the liquor, 'tis plain, thole (learns can eafily 

 penetrate the wood of the containing vcf- 

 fels. No wonder then, that the more fub- 

 tile lightning mould have the like efFect. I 

 know not whether the common practice of 

 laying a bar of iron on a veficl, be a good 

 prefervativeagainft the ill effects of lightning 

 on liquors I fhould think that the covering 

 a veiTei with a large cloth dipped in a ftrong 

 brine, would be a better prefcrvative > for 

 falts are known to be ftrong attracters of 

 fulphur. 



The certain death which comes on the ex- 

 plofion of Mines, feems to be effected in 

 the fame manner : For tho' at firft there is 

 a great expanflon of the air, which muft 

 dilate the lungs, yet that air is no fooner 

 filled with fuliginous vapours, but a good 

 deal of its elafticity is immediately deftroyed : 

 As in the cafe of burning Matches in Ex- 

 periment 103, the heat of the flame at firft 

 expanded the air ; but notwithstanding the 

 flame continued burning, it immediately 

 contraaed, and loll much of its elafticity, 

 as foon as feme quantity of fulphureous 



fteams afcended in it. 



S z Which 



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