[ 220 ] 
celebrated waters ; fuch as my engagements, and the 
apparatus that I could readily there procure, would 
admit of : The refult of which experiments I now 
beg leave to lay before the Society. 
Experiment I. 
Having filled a common quart bottle with Spa 
water at the fountain Pouhon, I took a dried calf’s 
bladder, made limber with oil, from which I care- 
fully prefied out the air, by twilling it round, then 
drawing its orifice over the neck of the bottle, there 
tied it clofe, fo as to leave an open communication 
between the water in the bottle and the empty cavity 
of the bladder, while the external air was excluded 
from both. I filled two other quart bottles with the 
Pouhon water, and fitted to them bladders in ftke 
manner. Thefe bottles Hood fourteen days, during 
the month of July, in a warm room ; where I often 
examined them, expelling to have feen the bladders 
difiended with air arifing from the water. But in this 
was difappointed. For, during thofe fourteen days, 
I never could difcover any air-bubbles adhering to the 
infides of the bottles j neither, from other figns, did 
it appear that any elaftic fubflance was feparated from 
the water j the bladders, all that time, remaining as 
empty as when firfi; tied on. Some of the water, be- 
ing then poured from each of the bottles, was found 
to fparkle more than when taken, frefii' from the 
fountain, and Iboner to emit bubbles on the fides of 
the glafl^ into which it was poured : it was perfedlly 
clear, and Hill retained its brifk and pungent tafle, to 
which was added a tafte from the bladders : but, in 
all 
