When the weights of 62 chicks (table XVI) were put down and averaged for their last eight days ashore there was shown to be a steady fall in weight. Table XVII indicates that nearly 70% of the chicks leave weighing between 105 and 124.9 grams. To sum up, it would appear that the chicks retain a comparatively heavy weight to within about four days of departing when many of them drop considerably during a short fast period of varying length, even up to six days in extreme cases. As against this 15.6% of the chicks were fed on the night before they left. Table XXIII. 9 a.m. and 9 p.m. Weights of 7 Chicks to 28 Days of Age and then 10 Chicks Till They Flew, Grouped into Class Intervals of 4 Days. Class Interval in Days 1940–41 No. of wts. a.m. wts. gms. No. of wts. p.m. wts. gms. Difference between even, and morn. wts. 1–4 17 21.76 19 20.86 .9 5–8 28 34.2 28 29.8 4.4 9–12 28 52.44 28 44.48 7.96 13–16 28 65.13 28 55.26 9.87 17–20 28 78.86 28 70.61 8.25 21–24 28 96.79 28 88.08 8.71 25–28 28 104.35 28 97.64 6.71 1941–42 29–32 26 156.43 31 144.3 12.13 33–36 36 157.93 38 149.34 8.59 37–40 40 168.2 40 155.25 12.97 41–44 40 166.72 40 154.52 12.2 45–48 37 147.6 37 138.98 8.62 49–52 17 127.02 17 121.56 5.46 53–56 3 124.66 3 118.66 6.0 Some of the weights and increases in weights of the 10 chicks which were weighed in 1941–42 from 28 days of age are interesting. Four of them passed the 200-gram mark. One did so on one occasion only, two did it three times and one exceeded this weight four times. Chick 3R was 225 grams at 9 a.m. when 39 days old and left the island eight days later weighing 131 grams at 9 p.m. (see Graph). Actually chick 5 was the lightest, reaching a peak weight of only 148 grams at 9 a.m. when 34 days old; its final weight was 98 grams when 49 days old. This was the only one of the ten chicks to fly under 100 grams, the range being from 131 to 98. The graph gives a good idea of the growth curve of a chick and also clearly shows the peaks and hollows caused by the irregular amount of food received, and by the weights when no feeding occurred. The 9 a.m. and 9 p.m. weights of three typical chicks are recorded. Those for chick 22 are complete up to the 39th day and indicate a greater number of nightly fasts than usual. The graph for chick 7R overlaps that for chick 22 and is inserted to indicate what happens during the final stages. This chick stayed ashore much longer than the average and did not attain a very heavy weight. Chick 3R was one of several, which besides being heavier in its earlier stages, reached a very heavy weight not long