ame yellow as if corroded by
_aqua fortis_. After 14 days I made a hole in the bladder tied over the
flask, having previously held it, inverted, under water; the water rose
rapidly into the flask, and it remained only 2/3 empty.

+14. Seventh Experiment.+--(_a._) I immersed the mouth of a flask in a
vessel with oil of turpentine. The oil rose in the flask a few lines
every day. After the lapse of 14 days the fourth part of the flask was
filled with it; I allowed it to stand for 3 weeks longer, but the oil
did not rise higher. All those oils which dry in the air, and become
converted into resinous substances, possess this property. Oil of
turpentine, however, and linseed oil rise up sooner if the flask is
previously rinsed out with a concentrated sharp ley. (_b._) I poured 2
ounces of colourless and transparent animal oil of Dippel into a bottle
and closed it very lightly; after the expiry of two months the oil was
thick and black. I then held the bottle, inverted, under water and drew
out the cork; the bottle immediately became 1/4 filed with water.

+15. Eighth Experiment.+--(_a._) I dissolved 2 ounces of vitriol of iron
in 32 ounces of water, and precipitated this solution with a caustic
ley. After the precipitate had settled, I poured away the clear fluid
and put the dark green precipitate of iron so obtained, together with
the remaining water, into the before-mentioned bottle (Sec. 8), and closed
it tightly. After 14 days (during which time I shook the bottle
frequently), this green calx of iron had acquired the colour of crocus
of iron, and of 40 parts of air 12 had been lost. (_b._) When iron
filings are moistened with some water and preserved for a few weeks in a
well closed bottle, a portion of the air is likewise lost. (_c._) The
solution of iron in vinegar has the same effect upon air. In this case
the vinegar permits the dissolved iron to fall out in the form of a
yellow crocus, and becomes completely deprived of this metal. (_d._) The
solution of copper prepared in closed vessels with spirit of salt
likewise diminishes air. In none of the foregoing kinds of air can
either a candle burn or the smallest spark glow.

+16.+ It is seen from these experiments that phlogiston, the simple
inflammable principle, is present in each of them. It is known that the
air strongly attracts to itself the inflammable part of substances and
deprives them of it: not only this may be seen from the experiments
cited, but i