Analyjis of the Air. 229 
fumes at the fame time deftroying the 
clafticity of the air. I took care to make 
the air in both tubes of the fame tempera- 
ture, by firft immerfing them in cold water, 
before I compreffed them. 
Experiment CVI. 
I fet a lighted tallow Candle^ which was 
about to of an inch diameter, under the in- 
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 defeend for a quarter of a mi- 
nute, and after that afeend, notv/ithftand- 
ing the Candle continued burning, and heat- 
ing the air for near 3 minutes. It was ob- 
fervable in this Experiment, that the fur- 
face of the water z z did not afeend with 
an equal progreflion, but would be fome- 
times flationary j and it would fometimcs 
move with a flow, and fometimes with an 
accelerated motion 5 but the denfer the fumes 
the fafter it afeended. As foon as the Can- 
dle was out, I marked the height of the 
water above z z, which difference was e- 
qual to the quantity of air, whofe elaf 
3 tidty 
