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when the anterior edge of the canvas chin piece rested in the open mouth during a prolonged suboccipital craniotomy. An objection may be found in that the canvas piece (Fig. 1 B and Fig. 2 C) covers the eyes, preventing examination of them during the anesthetic. We have not found this a disadvantage; but if this is found undesirable, a metal piece (Fig. I A) may be inserted into the head rest at b and the same range of movements and adjustments obtained, or additional holes for the eyes may bedoi:10.1001/jama.1922.26420100003014b fatcat:yzndtwkqtzfxbjcuwkluiwl7dy