The Journal of laboratory and clinical medicine . i bromide, somnoform, etc., may be sprayedinto the machine through a short [)iece of rul)l)er tul)ing carrying a clip (27).Still nearer the pump is another air-cock (30) through which less xolatile sub-stances such as ether or chloroform (or ethyl bromide) may be injected froma burette (31). This permits of very accurate dosage, but in this connection 8 The Journal of Laboratory and Clinical Medicine one must remember that it is necessary to saturate the air and solutions mthe machine to a certain definite degree in order to secure and maintain
The Journal of laboratory and clinical medicine . i bromide, somnoform, etc., may be sprayedinto the machine through a short [)iece of rul)l)er tul)ing carrying a clip (27).Still nearer the pump is another air-cock (30) through which less xolatile sub-stances such as ether or chloroform (or ethyl bromide) may be injected froma burette (31). This permits of very accurate dosage, but in this connection 8 The Journal of Laboratory and Clinical Medicine one must remember that it is necessary to saturate the air and solutions mthe machine to a certain definite degree in order to secure and maintain any def-inite degree of anaesthesia in the animal. This can be done, however, approxi-mately at least, by injecting some ether, etc., into the machine and running the. Fig. 7.—General view of the riglit-hand side of the apparatus. The face-piece and breathingbag as arranged for man are shown at the top of the apparatus. Just to the left of the bag isshown a twenty-five cubic centimetre burette (graduated to tenths of a ) used for the injectionof ether, chloroform, etc., into the air system. pump for a little time before the machine is connected to the animal. It is ad-visable to do this also with nitrous oxide. Still nearer to the pump is another valve (34) which is placed in the mainair circuit. This valve corresponds with the valve (5) which is also placed inthe main air circuit. Valve (33) opens to the outside air. If, while the pumpis running, valve (4) be slightly opened a little air will be forced out of thesystem into the room. This will instantly reduce the quantity of air in the re- General Analgesia and Anccsthesia 9 spiratory bag. By watching the bag as one opens the valve (4) cautiously thetension of the air in the bag can be immed
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