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the flafk, after it had flood, thus filled, for three 
hours, in a heat of 76 degrees ; which rarefadion of 
the water, by the common heat of the air in fummer, 
was more than fufficient to have broken the flafk, had 
it been filled quite full with the water, and immedi- 
ately clofed at the fountain. 
Experiment II. 
I took one of the long Frontiniac vials, which 
might contain about 21 ounces avoirdupoife weight 
of Spa water, and which had flood feven days, in 
exceffive hot weather, filled with Pouhon water, with 
a bladder fitted to it, as related in the foregoing ex- 
periments. The vial thus filled was placed in a 
copper vefTel, fo as to be immerfed in water to two 
thirds of its height ; and to the neck of the vial was 
fitted a kind of truncated cone, of fpiral wire, to keep 
the bladder in an ered:pofition. (SeeTAB.VII. Fig. i.) 
The copper vefTel was fet over a flow fire, and the water 
therein heated to as great a degree as I could well 
endure with my hand; which 1 found to be about 
1 10 degrees, according to Fahrenheit’s fcale. In 
this degree of heat, large bubbles of air Toon began 
to arife to the top of the vial, forcing up with them 
final! particles of water, which bedewed the fides of 
the bladder two inches, or more, in height. The vial 
being taken for a few moments out of the bath, the 
more exadlly to view this kind of ebullition ; very 
minute bubbles were obferved to be formed, in the 
middle of the water, near the bottom of the vial ; 
and from thence afcending with a rapid motion, and 
in continued flreams, gradually to enlarge, until they 
flew 
