boil. Now apply a lighted match to the end of the pipe-stem or glass
tube. 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. His breath
smells of alcohol. This is because his lungs are trying to remove the
alcohol from his blood as fast as possible, so as to prevent injury to
the blood corpuscles and the tissues of the body. It is the vapor of
alcohol mixed with his breath that causes the odor.

~8.~ You may have heard that sometimes men take such quantities of
liquor that the breath becomes strong with the vapor of alcohol and
takes fire when a light is brought near the mouth. These stories are
probably not true, although it sometimes happens that persons become
diseased in such a way that the breath will take fire if it comes in
contact with a light. Alcohol may be a cause of this kind of disease.

~9. Making Alcohol.~--It may be that some of our young readers would
like to find out for themselves that alcohol is really made by
fermentation. This may be done by an easy experiment. You know that
yeast will cause bread to "rise" or ferment. As we have elsewhere
learned, a little alcohol is formed in the fermentation of bread, but is