A/ialyfis of the Air. i6^ 
coalefcc, whereby they are rendredtoogrofs 
to enter^the minute vefides 5 which arc alfo 
much contracted, as well by the iofs of the 
clafticity of the contained air, as by the con- 
tradion occafioned by the ftimularing, acid, 
fulphureous vapours. And *tis not impro- 
bable that one great defign of nature, in the 
ftruchire of this important and wonderful 
'uifeusy w'as to frame its veficlcs fo very 
minute, thereby effedualiy to hinder the 
ingrefs of grofs feculent particles, which 
might be injurious to the animal oeconomy. 
This quality of faits ftrocgly to attracT: 
fulphureous, acid and other noxious particles, 
mi2:ht make them verv beneficial to man- 
kind in many other refpecls. Thus in fe- 
veral unw^holfome trades, as the fmelters 
of metals, the ceruls-makers, the plumbers, 
it might not unlikely be of good fcrvice 
to them in preferving them in fomc meafure 
at Icaft, from the noxious fumes of the ma- 
terials they deal Ln, w^hich by many of the 
foregoing experiments w^e are aflured muft 
needs coalefce with the elaftick air in the 
lungs, and be lodged there 5 to prevent 
which inconvenience the w’orkmen might, 
w^hile they are at w'ork, make ufe of pretty 
broad 
