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USE OF GENERAL ANESTHETICS. 621
extraction of teeth, and under ordinary circumstances is the best. Until
lately every operator was his owu maker of the gas—this was a great
disadvantage—but now it can be procured in a liquefied form com-
FiG. 564.
Nitrous oxid inhaler.
pressed in cylinders. There are many different appliances used for
the administering of this gas even when using it in a condensed form.
One of the most prominent is that shown in Figs. 5G2 and 563, in
