The dynamometer results show no gain in strength of grip six months after operation. Indeed the average of the gains of the operative cases is slightly less than the average gain of the controls. Comparing the test group with the control, we find the average of the differences to be -.24. But the variability is so high (P. E. = +-.48) as to render this figure unreliable. The greatest loss in strength of grip is found in the control group, but the greatest gain is also in this group. Seven cases in the test group show a loss, as compared with only three control cases. In eight, or one-half of the sixteen cases, the control member of a pair gained more than the test member. Considering the three pairs of nutrition cases, we find that in pair number 7 the test case loses 1.5 Kg. when compared with the control; and in pair number 10, 6.5 Kg., while the test case in pair 11 gains 4 Kg. The conclusion from the data would seem to be that, within the space of six months at any rate, operation for adenoids and tonsils brings about no increase in strength of grip. TABLE V Showing change in per cent over or underweight for height and age, 18 pairs A B A-B N[16] 1 2 3 4 5 6 7 8 - 1 - 1 0 -13 - 5 + 8 - 8 11 - 3 -12 -9 - 9 -11 - 2 - 7 10 - 1 - 5 -4 - 6 - 8 - 2 - 2 28 - 7 - 7 0 0 + 2 + 2 - 2 13 -13 -19 -6 -11 -15 - 4 - 2 19 + 6 + 8 +2 + 1 + 5 + 4 - 2 6 + 2 - 3 -5 + 5 + 1 - 4 - 1 14 -13 - 9 +4 - 5 0 + 5 - 1 7 - 8 -15 -7 - 7 -14 - 7 0 2 - 8 - 6 +2 + 9 +10 + 1 + 1 3 + 6 + 8 +2 - 5 - 8 - 3 + 5 16 -16 -15 +1 -13 -17 - 4 + 5 25 - 8 - 7 +1 + 4 - 1 - 5 + 6 5 - 4 - 1 +3 + 8 + 4 - 4 + 7 9 - 8 -11 -3 - 7 -17 -10 + 7 26 - 1 + 5 +6 + 1 0 - 1 + 7 4 - 7 - 7 0 -15 -23 - 8 + 8 1 0 + 8 +8 + 8 + 4 - 4 +12 Av. - 4.67 - 4.94 - .28 - 3.06 - 5.17 - 2.11 + 1.83 M + .5 - 3.5 + 4.00 75%ile +2 0 6.5 25%ile -2 - 4.5 - 2 Q 2 2.25 4.25 P. E. (distribution) 3 2.39 1.33 P. E. (average) +-.71 +- 57 +- 91