Other children in the test group who made large gains, were case 12, with a gain of 18.5 pounds after twelve months, compared with 4.5 pounds after six months; case 19, gain of 6.3 pounds after first six months, and 18 pounds after 12 months; case 21, whose gain after the first period was 5.8 pounds, but who gained 14.8 pounds after twelve months. In these cases the gain in the second period greatly exceeds that for the first. TABLE XVI Height, Second Retests, 13 Pairs N[16] Test Group (A) Control Group (B) Test 1 Test 3 Gain Test 1 Test 3 Gain A-B 13 61.3 61.8 .5 56.8 60 3.2 -2.7 2 42.6 45.9 3.3 45.2 49.8 4.6 -1.3 28 54.9 56.3 1.4 53.4 55.9 2.5 -1.1 8 50.8 52.3 1.5 46.8 48.7 1.9 - .4 10 46.1 48.6 2.5 45.6 48.1 2.5 .0 1 46 49.7 3.7 46.4 49.7 3.3 .4 11 45.8 49.5 3.7 43.6 46.8 3.2 .5 16 51.6 53.5 1.9 48.7 50.1 1.4 .5 14 51 53.3 2.3 57.9 59.5 1.6 .7 3 47 50.2 3.2 51.7 54 2.3 .9 7 42.9 45.6 2.7 41.9 43.7 1.8 .9 4 47.5 50.5 3 48.9 50.8 1.9 1.1 19 57.7 60.5 2.8 46.7 4.8 1.3 1.5 Av. 49.63 52.17 2.5 48.74 51.16 2.42 .08 M 2.7 2.3 .5 75%ile 3.15 2.85 .85 25%ile 1.6 1.75 .92 Q .775 .65 .885 P. E. (distribution) .66 .78 .82 P. E. (average) +-.18 +-.22 +-.28 Av.=.29 P. E. M.=1.79 P. E. In weight, then, the mean gain of the test group over and above the control continues to increase through the second period of six months. The variability, however, increases enormously, which fact is due possibly to varying conditions which may enter in during the longer period to affect the health and thus lessen the gain of some of the children.