The art of anaesthesia . Fio. 118.—The needle is introduced in the middle line forward and inward. (Steel, International Clinics.) THE ADMINISTRATION 271. Fig. 119,—As the dura is pierced, the cerebrospinal fluid escapes and may be collected in test-tube for further study. (Steel, International Clinics.) The Advantages of the Method 1. When acting satisfactorily it insures a quiet field ofoperation. 2. Reduces the amount of after-sickness. 3. The necessary apparatus is comparatively simple. 4. May prove of value where there is an absolute con- 272 ANESTHESIA

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