. Journal of roentgenology . )4 THE JOURNAL OF ROENTGENOLOGY chair is stopped quickly, eyes opened—there should occur ahorizontal nystagmus to the left, of twenty-six seconds dura-tion. A variation of ten seconds, up or down, is is repeated, turning to the left, and the findings shouldbe the same except that nystagmus is now to the right. (2) Pointing. Candidate still in chair, eyes closed,faces examiner, touches examiners finger held at armslength in front of him, he then raises his arm to perpendic- ular position, lowers it to find the examiners finger. Thisis done first with
. Journal of roentgenology . )4 THE JOURNAL OF ROENTGENOLOGY chair is stopped quickly, eyes opened—there should occur ahorizontal nystagmus to the left, of twenty-six seconds dura-tion. A variation of ten seconds, up or down, is is repeated, turning to the left, and the findings shouldbe the same except that nystagmus is now to the right. (2) Pointing. Candidate still in chair, eyes closed,faces examiner, touches examiners finger held at armslength in front of him, he then raises his arm to perpendic- ular position, lowers it to find the examiners finger. Thisis done first with the right arm, then with the left. A nor-mal person finds it easily. This test is repeated after turn-ing to the right, ten turns in ten seconds, chair stoppedquickly, first the right then the left is tested until candidateceases to past-point. The normal individual, after turningto the right, will past-point to the right. This same test isnow repeated turning to the left. He should past-point,with both hands, to the EAR AND AVIATION 95 (3) Falling. Candidates head inclined ninety degreesforward. He is turned to the right, five turns in ten sec-onds, stopping he sits up, eyes closed, falls to the tests the vertical semicirculars. This is repeated,turning to the left, he should fall to the left. The accom-panying cut shows the standard chair. These tests, simple in execution, short in time, the wholeseries requiring but three to five minutes, separate the ob-viously fit and the unfit. Border line cases, that is, thosein which some one of the reactions is not normal, are furthertested by means of the caloric. The turning test tests bothears simultaneously, the caloric tests each ear at 68 degrees F. is allowed to run into the externalauditory canal, from a height of three feet, through a stopnozzle, with the head tilted thirty degrees forward, untilthe eyes are seen to jerk or the applicant becomes nystagmus should be rotary. This sh
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