Analyfis of the Air. 1 6$ 



coalefcc, whereby they arc rendred too grofs 

 to enter j:he minute veficles 3 which are alfo 

 much contracted, as well by the lofs of the 

 elafticity of the contained air, as by the con- 

 traction occafioned by the ftimulating, acid, 

 fulphureous vapours. And 'tis not impro- 

 bable that one great defign of nature, in the 

 ftru&ure of this important and wonderful 

 viftus, was to frame its veficles fo very 

 minute, thereby effe&ually to hinder the 

 ingrefs of grofs feculent particles, which 

 might be injurious to the animal oeconomy 9 

 This quality of falts ftrongly to attrad 

 fulphureous^ acid and other noxious particles, 

 might make them very beneficial to man- 

 kind in many other refpe&s* Thus in fe- 

 veral unwholfome trades, as the fmelters 

 of metals, the cerufs-makers, the plumbers^ 

 &c. it might not unlikely be of good fer vice 

 to them in preferving them in fome meafure 

 at leaft, from the noxious fumes of the ma- 

 terials they deal in, which by many of the 

 foregoing experiments we are affured muft 

 needs coalefce with the elaftick air in the 

 lungs, and be lodged there 5 to prevent 

 which inconvenience the workmen mighty 

 while they are at work, make ufe of pretty 



broad 



