Analyjis of the* Air. 23} 



verted receiver z z a a, (Fig. 35. ) and with 

 a fyphon I immediately drew the water up 

 to z z : Then drawing out the fyphon, the 

 water would defcend for a quarter of a mi- 

 nute, and afcer that afcend, notwithftand- 

 ing the Candle continued burning, and heat- 

 ing the air for near 3 minutes. It was ob- 

 fervabje in this Experiment, that the fur- 

 face of the water z z did not afcend with 

 an equal progreflion, but would be fome- 

 times ftationary ; and it would fometimes 

 move with a flow, and fometimes with an 

 accelerated motion ; but the denfer the fume?, 

 the fafter it afcended. As foon as the Can- 

 dle was out, 1 marked the height of the 

 water above z z, which difference was 

 equal to the quantity of air, whofe elafti- 

 city was deftroyed by the burning Candle. 

 As the air cooled and condenfed in the re- 

 ceiver, the water would continue rifing 

 above the mark, not only till all was cool, 

 but for 20 or 30 hours after that, which 

 height it kept, tho' it flood many days; 

 which (hews that the air did not recover the 

 elafticity which it had loft. 



The event was the fame, when for great- 

 er accuracy I repeated this Experiment by 

 lighting the Candle after it was placed un- 

 der 



