out at once if the air is very
impure, because of lack of oxygen to keep it burning.

Rescue: 1. Remove the patient _at once_ to the fresh air. Gas is lighter
than air, and therefore will not be found close to the floor and it will
often be possible to crawl out when one would be overcome by the gas if
he tried to walk out. For this reason it is sometimes best in trying to
rescue anyone already unconscious from gas to tie the wrists together
with a handkerchief, put his arms around your neck, and crawl out on all
fours, dragging the insensible body with you, under your own body. If
you attempt to walk out and carry the patient, cover your mouth and nose
with a wet handkerchief, go very quickly, do not breathe until you reach
the fresh air.

2. If there is a messenger handy, send for the doctor at once, but in
the meantime if necessary, perform artificial respiration as outlined
under the Schaefer System in the preceding paragraphs, until the patient
is restored to normal breathing.

ELECTRIC SHOCK

This is caused by some part of the body coming in contact with a live
electric wire. The seriousness of the shock depends on how heavy a
charge of electricity the wire is carrying at the time.

The patient is usually unable to release himself from the wire. The
first thing to be done, if possible, is to turn off the current by means
of the switch, but if this cannot be done _at once_, the patient must be
rescued by pulling him away from the wire.

Remember his body will easily carry the charge to yours while he is
against the wire. Therefore you must "insulate" yourself--that is, put
on your hands something that will not let the electricity into your
body--or stand on something that will "insulate" you; for instance,
rubber gloves or rubber tobacco pouches, dry silk handkerchiefs, other
silk garments or newspapers used in place of gloves if necessary. Stand
on a rubber mat or on _dry boards_, or glass, or in dire necessity _dry_
clothes can be used to stand on. They must not be wet as then they will
carry the electric current through your body and you must also be
rescued instead of rescuing.

Prevention: 1. Do not touch the "third rail" of electric railways.

2. Do not catch hold of swinging wires, they may be "live wires."

3. Report broken wires to the right authorities.

Treatment:

1. Get patient loose from the current.

2. Send for the doctor.

3. Lay the patient flat on his back.

4. Loosen the clo