Mayhew 1952 Mallard 41. June 6 Gray Lodge Refuge, Sutter Co., Calif. Today more readings were taken from duck nests on the refuge. The day was 100% overcast with a strong (about 25 m.p.h.) S.E. wind blowing. At 7:35 A.M. the air temp. at waist height (43 inches) was 16°C., relative humidity 71%. On bare ground at that time, the temp. was 17°C., rel. hum. 71%. At 8:45 A.M., in low dense cover, the ground temp. was 18°C., rel. hum. 66%. All readings today were taken between 7:30 + 11:30 A.M. At 11:30, ground temp. was 24°C., rel. hum. 45%; air temp (43") was 21.5°C., rel. hum. 44%. Nest 18 - (Badwall) 2 intact eggs + 1 broken egg remained of the clutch. The ♀ was flushed from the nest & remained within 20 feet of the nest the entire time I was there. Cover of wild oats was about 12 inches high, but was very sparse close to the nest. There was lots of down in the nest. (Some heavy paper was fastened around the sides of the hygrometer so that the moisture being measured came directly from the nest.) The nearest water was about 50 yards away, Temp. - 26°C.; R.H. - 83%. Nest 23 - (Badwall) The ♀ was flushed from 6 eggs at this nest. There was lots of down present in the nest. The nearest water was about 15 feet away.