Av. 14.27 14.61 .34 13.54 15.19 1.65 -1.31 M 0 1.5 -1.5 75%ile 1.25 3.75 .62 25%ile -1.38 .12 -.4 Q 1.31 1.81 .51 P. E. (distribution) 1.34 1.65 2.31 P. E. (average) +-.37 +-.46 +-.59 Av.=-2.22 P. E. M.=-2.54 P. E. 6 12 months months Average of gains of test group in excess of control -.24 -1.31 Median of gains of test group in excess of control -1.00 -1.50 P. E. of difference +-.48 +-.59 Average in terms of P. E. -.50 -2.22 Median in terms of P. E. -2.08 -2.54 The greatest gain in the test group after twelve months is 5 Kg. (Case 1). During the first six months this case lost 1 Kg. There are two gains of 5 Kg. in the control group. Of these two (cases 7 and 13) had gained 1 Kg. during the first interval and another (case 2) 2 Kg. The greatest loss in the test group after the twelve months' period was 3 Kg., by case 27, which had already lost this amount at the end of six months. The greatest loss in the control group was suffered by case 11, a loss of 4 Kg., all in the second period. After the first period, 9 out of 16 cases in the test group gained in strength of grip, and 13 in the control group. After the second period, the test cases showing gain numbered only 7 out of 13, while all of the control cases had gained except 2. Of the test group 8 cases in the second period either gained less than half of the amount they had improved in the first period, or dropped from the scores they had made at that time. The corresponding numbers for the control group are 6 and 7. There is evidently no improvement in strength of grip twelve months after operation. The unreliability of the results is very great. However, there is certainly no tendency toward improvement. Why this should be is a question. It may be that the change in examiners is partly responsible, for performance in this test is influenced to a surprising extent by the manner in which it is presented. TABLE XIX Tapping--Second Retest, 15 Pairs N[16] Test Group (A) Control Group (B) Test 1 Test 3 Gain Test 1 Test 3 Gain A-B