2 L 24 J 
I placed, in a warm fun-fhine, g 
great number of inverted jars, full 
of pump water, and collected care- 
fully from them all the air yielded 
by thefe bubbles, which proved to 
be much worfe than the common 
air. 
I boiled fome pump watcr in a 
pot, . jo which I had placed-a long 
cylindrical jar, quite full of the fame 
water: a good deal of air was col- 
lected at the top of the inverted jar, 
which was by the heat difengaged 
from the water. This air proved to 
be much worfe than common air, 
ard entirely unfit for refpiration, _ 
_ Abbé Fontana has made, ‘fome 
sears: ago, a great many experi- 
ments, tending to inveftigate the 
‘nature of air contained in different 
waters. 
SEC. 
