the experiments
mentioned in Sec.Sec. 8.16 shew distinctly. But the following will shew that
that portion of the air which unites with the inflammable substance, and
is at the same time absorbed by it, is replaced by the newly formed
aerial acid.

+22. Sixth Experiment.+--After the fire had gone out and everything had
become cold in the experiments mentioned above (Sec. 21. _a._ _b._ _c._), I
poured into each flask 6 ounces of milk of lime (lime water which has in
it more unslaked lime than the water can dissolve); I then placed my
hand firmly on the mouth of the flask and swung it several times up and
down; then I held the flask inverted under water and drew my hand a
little to one side, so that a small orifice might be made. Water
immediately rose into the flask. Then I shut the mouth again very
tightly with my hand under water, and afterwards shook it several times
up and down. I opened it again under water; this operation I repeated
twice more until no more water would rise into the flask, or until no
more aerial acid was present in it. I then perceived that in each
experiment between 7 and 8 ounces of water rose into the flasks,
consequently the nineteenth part of the air has been lost. This was
indeed something, but since in the combustion of phosphorus (Sec. 17)
nearly the third part of the air was lost, there must be another reason
besides, why as much is not absorbed in this case also. It is known that
one part of aerial acid mixed with 10 parts of ordinary air extinguishes
fire; and there are here in addition, expanded by the heat of the flame
and surrounding the latter, the watery vapours produced by the
destruction of these oily substances. It is these two elastic fluids,
separating themselves from such a flame, which present no small
hindrance to the fire which would otherwise certainly burn much longer,
especially since there is here no current of air by means of which they
can be driven away from the flame. When the aerial acid is separated
from this air by milk of lime, then a candle can burn in it again,
although only for a very short time.

+23. Seventh Experiment.+--I placed upon the stand (Sec. 21. _b._) a small
crucible which was filled with sulphur; I set fire to it and placed the
flask over it. After the sulphur was extinguished and everything had
become cold, I found that out of 160 parts of air, 2 parts were driven
out of the flask by the heat of the flame. I next poured 6 ounces of
clear