Perhaps you will observe nothing at first, but continue placing the match to the pipe-stem, and pretty soon you will notice a little blue flame burning at the end of the stem.

It will go out often, but you can light it again.

This is proof that alcohol is escaping from the liquid in the bottle.

After the liquid has been boiling for some time, the flame goes out, and cannot be re-lighted, because the alcohol has been all driven off.
[Illustration: Alcohol experiment.] ~7.

The Alcohol Breath.~--You have doubtless heard that a person who is under the influence of liquor may be known by his breath.