



1 



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Analyfis of the Air. 



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Which fleams have doubtlefs the fame '^ 

 efFe&on the air, in the lun^s of Animals .. 

 held over them ; as in the Grotto di cam/, 

 or when a clofe room is filled with them,' . or 

 where they certainly fuffocate. * ,*Z, 



It is found by Experiments 103, io<5, 

 and 107, that an air greatly charged with 

 vapours lofes much of its elafticity, which 



is the reafon why fubtcrraneous damps fuf- 



fcs« 



focate Animals, and extinguilh the flame oft* * 

 Candles. And by Experiment io<5, we fee-'* 

 that the fooner a Candle goes out, the faft-: ™ 

 cr the air lofes its elafticity. 



Experiment CXV. ^-^ 



This put me upon attempting to find fome; ; ■ 

 means to qualify and rebate the deadly noxi-idoa 

 ous quality of thefe vapours : And in order&ioa* 

 to it, I put thro' the hole, in the top of the :; . 

 air pump receiver (Fig. 32.) which con-,^ 

 tained two quarts, one leg of an iron iyphon^A 

 made of a gun barrel, which reached near,. 

 to the bottom of the receiver : It was ce- 

 mented faft at z, I tyed three folds of wool-, _ 

 len cloth over the orifice of the fyphon,." 

 which was in the receiver. The Candle went • 



out in kfs than two minutes, tho' I conti- 



^ nued *t 



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