Mayhew 1952 Mallard 33. April 26 Chiles Ranch, 3 mi. N.E. of Davis, Yolo Co., Calif. their backs showing. I stopped & backed up, but the ♀ was leading the young into the dense tulees nearby so that I didn't get too good a look at the young; however, I would judge them to be a couple of weeks old. ② About 100 yards farther west a ♀ and 5 young were seen, + these were about the same age as the previous brood. April 29 Conway Ranch, 2 mi. east of Woodland, Yolo Co., Calif. ③ A ♀ and 9 youngsters about 2 weeks old was seen in the large drainage ditch forming the southern boundary of the ranch. She led them into the tulees, but pretty soon 2 of the youngsters were swimming about among the tulees, but in plain sight from where I sat in the car. Shortly 3 more were seen swimming with the first 2, but no more made their appearance after that. Several hours were spent walking through a wheat field looking for nests. No nests were found, however. The field is 1 mile long & 3/4 mile wide. Four trips were made across the width of the field. The stand of grain in the portion of the field I walked is not very good. The best grain is about 30 inches high, but a good deal of it is less than 12 inches in height. at 11:55 I took the temperature & relative humidity on the ground in some of the