Page 624 - My FlipBook

622 EXTRACTION OF TEETH.

wliieli tlie _o:as is drawn into a reservoir and tlien passes through a flex-
ible tube to the ni(»iitli-j)iece (Figs. 564 and /3G5).

Fig. 565.

Hood inhaler.
The two principal mouth-pieces are Fig. 564, which should have
the detachable lip-shield removed so that the tube may be placed
directly into the mouth and the lips compressed around the tube by
the operator, at the same time closing the nostril by the thumb
and finger, and Fig. 565, which is known as a hood inhaler; it is