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Experiment II. 
I filled a Florence flafk in the fame way with the 
fame kind of fixed air. When full, I ftopt up the 
mouth of the flaik with my finger, w'hile under water, 
and removed it into a vefifel of quickfilver, fo that the 
mouth of the flaik was intirely immerfed therein. It 
was kept in this fituation upwards of a week. The 
quickfilver role and fell in the neck of the flafk, ac- 
cording to the alterations oi heat and cold, and of the 
height of the barometer; as it would have done if it 
had been filled with common air. But it appeared, 
by comparing together the heights of the quickfilver 
at the lame temper of the atmofphere, that no part of 
the fixed air had been abforbed or loft its elafticity. 
The flafk was then removed, in the fame manner as 
before, into a vefiel of fope leys. The fixed air, by 
this means, coming in contact with the fope leys, was 
quickly abforbed. 
I alfo filled another Florence flafk with fixed air, 
and kept it with its mouth immerfed in a veflel of 
quickfilver in the fame manner as the other, for up- 
wards of a year, without being able to perceive any 
air to be abforbed. On removing it into a veflel 
of fope leys, the air was quickly abforbed like the 
former. 
It appears from this experiment, that fixed air has 
no difpofiticn to lofe its elafticity, unlefs it meets with 
air. Lime water is a folution oflime in water : therefore, on mixing 
lime water with any liquor containing fixed air, the lime ablorbs 
the air, becomes infoluble in water, and is precipitated. This 
property of water, of abforbing fixed air, anil then making a 
precipitate with lime water, has been taken notice of by Mr. 
. M ‘Bride. 
water, 
