Analyfis of the Air, 273 



them : And therefore the Candle and Matches 

 ccafing toburn, foon after they arc confined 

 in a iinall quantity of air, fecms not to be 

 owing to their having rendrcd that air effete, 

 by having confumed its "vivifying fpirit; but 

 fhould rather be owing to the great quantity 

 of acid fuliginous vapours, with which that 

 air is charged, which dcilroy a good deal of 

 its elalticity, and very much clog and retard 

 the elallick motion of the remainder. 



And the effect the half exhaufting of a 

 receiver has upon the elalticity of the re- 

 maining half of the air, feems to be the rea- 

 fon why the flame of a Candle does not 

 continue burning, till it has filled the recei- 

 ver it ftands in with fumes, I £ goes out 

 the quicker, the (boner the air is drawn out 

 to that degree - t which feems therefore to be 

 owing to this, that an air ratified to double 

 its fpace, will not expand fo briskly with 

 the warmth of flame, as a more condenfed 

 air will do : And confequently action and 

 re-aclion being reciprocal, will not give Co 

 brisk a motion to the flame, which fubfifts 

 by a conftant fucceflion of frefh air, to fup- 

 ply the place of the either abforbed, or much 

 dilated air, which is continually flying off. 



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