Analyfis o) the Air. 



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numerable denfc bodies ; and that probably 

 from many of thole bodies, which when 

 they had their afcendirig fumes confined in 

 my CklTc.% abforbed more air than they 

 venerated, but would in a more free, open 

 fpacc generate more than they abforbed. 



I made fomc attempts both by fire, and 

 alfo by fermenting and abforbing mixtures, 

 to try if I could deprive all the particles of 

 any quantity of clallick air of their elasticity, 

 but I could not effect it : There is therefore 

 no direct proof from any of thefe Experi- 

 ments, that all the elaftick air may be ab- 

 forbed, tho' tis very probable it may, fines 

 we find it is in fuch great plenty generated 

 and abforbed ; it may well therefore be 

 all abforbed and changed from an elaf- 

 tick to a fixt fiate : For as Sir Isaac New- 

 ton obferves of light, " that nothing more 

 is requifite for producing all the variety of 

 colours, and degrees of refrangibility, than 

 that the rays of light be bodies of different 

 fizes i the leaf! of which may make the 

 weakeft and darkeft of the colours, and 

 be more cafily diverted, by refracting fur- 

 faces from the right courfe > and the reft, 

 <c as they are bigger and bigger, may make 



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