Analy/is of the Air. ijc) 
as the putting of fulphureous mixtures into 
the liquor, "tis plain, thofc ftcams can eafily 
penetrate the wood of the containing vef« 
fels. No wonder then, that the more fub- 
tile lightning fhould have the like efFed. I 
know not whether the common pradicc of 
laying a bar of iron on a Veflel, be a good 
prefervativeagainft the ill cfFeds of lightning 
on liquors I fhould think that the covering 
a veffel with a large cloth dipped in a flrong 
brine, would be a better prefervative 5 for 
falts are known to be ftrong attraders of 
fulphur. 
The certain death which comes on the ex- 
plofion of Mines, feems to be effeded ia 
the fame manner : For tho* at firft there is 
a great expanfion of the air, which mufl: 
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 5 but notwithftanding the 
flame continued burning, it immediately 
contraded, and loft much of its elafticity^ 
as foon as fome quantity of fulphureous 
fleams afeended in it* 
S 2 b 
Whidi 
