. Anaesthetics : their uses and administration. time it is confined to the use of ether, hedonal andisopral (see below) with the less frequent use of paraldehyde, Jsince chloroform employed in this way is extremelydangerous. Dr. F. S. Rood § has elaborated an excellentapparatus (fig. 42). This consists of a glass reservoir (A)capable of holding about three pints of saline containingether, supported on a stand eight feet above the floor reservoir is controlled by a ground accurately fittingstopcock on the drawn out end of the reservoir and isconnected by a rubber tube with the regula
. Anaesthetics : their uses and administration. time it is confined to the use of ether, hedonal andisopral (see below) with the less frequent use of paraldehyde, Jsince chloroform employed in this way is extremelydangerous. Dr. F. S. Rood § has elaborated an excellentapparatus (fig. 42). This consists of a glass reservoir (A)capable of holding about three pints of saline containingether, supported on a stand eight feet above the floor reservoir is controlled by a ground accurately fittingstopcock on the drawn out end of the reservoir and isconnected by a rubber tube with the regulating chamber (B).This has three openings, one uniting it with the reservoir,one connecting it by a rubber tube with the warming chambercontrolled by an accurately fitting glass stopcock, and one * Archiv. of Experiment. Vathol. and Pharmacol., Bd. 6i, p. 323.\ Siglo Medico, Oct. 9 and 16, Lancet, Nov. 2, 1912, p. 1220.• § Brit. Med. Jotir., 1911, vol. ii. p. 974 ; 1912, p. 608 ; and Proc. Roy. , 1912, vol. v., pt. I. p. Fig. 42.—Ether-infusion apparatusof Dr. F. S. Rood. ETHER. 179 which admits air, is capableof airtight occlusion bymeans of a rubber orground-glass stopper. Per-sonally I prefer the former, the rubber stopper, asless liable to jam. Whenthe reservoir tap is openedand theregulating-chambertap is closed, the saline-ether solution enters theregulating chamber and assoon as it is half full the air A 5 per cent, solution of ether innormal saline flows from a reservoir,which is fixed 8 ft. above the floorlevel, through the indicator, andthen through a warming chamberinto the cannula, and so into thevein. The indicator consists of acylindrical bulb with a capacity of8 oz. When the apparatus is work-ing, the lower half is full of thesolution, while the upper half con-tains air. The solution flows fromthe reservoir into the bulb througha pipette, and drips on to the sur-face of the fluid below. The systembeing a closed one, the pressurewithin
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