. The practice of anæsthetics . ter-effectswill be more marked. On the other hand, as manyteeth may be extracted in this way at one sitting aswould be possible in some cases in six sittings wherethe ordinary method was employed. 3.—The Administration of Nitrous Oxide Gas withOxygen. The most practical method of administering nitrousoxide gas with oxygen is that of Dr. Hewitt. Aftermany years of experimenting with different forms ofapparatus, he has now devised one which worksadmirably, and appears to be all that is required. As shown in fig 16, it consists of three steel cylinders(A, B and C),
. The practice of anæsthetics . ter-effectswill be more marked. On the other hand, as manyteeth may be extracted in this way at one sitting aswould be possible in some cases in six sittings wherethe ordinary method was employed. 3.—The Administration of Nitrous Oxide Gas withOxygen. The most practical method of administering nitrousoxide gas with oxygen is that of Dr. Hewitt. Aftermany years of experimenting with different forms ofapparatus, he has now devised one which worksadmirably, and appears to be all that is required. As shown in fig 16, it consists of three steel cylinders(A, B and C), fixed on a stand, and coupled in such away that the oxygen contained in the cylinder (A)passes into the tube (D), and the nitrous oxide gas,which is in both cylinders (B) and (C), passes through NITROUS OXIDE GAS 121 the tube (E). These tubes are connected by a Y-piecein such a way that one runs up inside the other ; andthey eventually separate again by another Y-piece justbefore entering the bag. This latter is divided down. Fig. i6.—Hewitts Apparatus for Administering Nitrous Oxide Gas with Oxygen. the middle by a partition which completely shuts offthe oxygen on one side from the nitrous oxide gas onthe other. The nitrous oxide gas leaves the bag by the metal 122 THE ADMINISTRATION OK tube (F) and directly enters the mixing chamber (J) ;while the oxygen leaves its half of the bag by the tube(G), and enters the oxygen chamber (H), which hasten small openings into the mixing chamber. The face-piece is the same as that used for nitrousoxide with air. Fig. 17 shows the stopcock on a largerscale. When the lever is placed as shown in iigs. 16and 17, the gas and the are both shut off,
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