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620 EXTRACTION OF TEETH.

afterward one, two, or three teeth may be removed, the nuiuber de-
pendiiitj; entirely upon their position and the dilKeulty to he overeome
in their extraction. As soon as the teeth are extracted the head of
the patient sh(»ul(l l)e raised from the head-rest and the l)ody carried
forward, and, having a hand euspi(h)r in front, the patient slionld be

Fig. 563.

— _. Water line

To gas cylinder

Sectional view of gasometer.
requested to eject the blood from the mouth ; this direction is usually
complied with. The patient in most instances recovers in a few
moments and with no disagreeable after-effects, but if the ether is
carried beyond the struggling stage to the point of complete sur-
gical narcosis the nauseating after-eflPects are very disagreeable unless
the patient has been thoroughly prepared for the occasion.
Nitrous oxid is the anesthetic most commonly administered for the