PEARSON 1951 aug. 13 Put 88 snap traps in Tilden Park across from Camp Padre and also at a new place further south. Baited half with apple and half with walnut, 7 p.m. aug. 14 Picked up traps at 7 a.m. Large area of the hillsides growing to thick, tall, coarse, round-stemmed grass plus scattered cominn have few mouse sign and few mice. More mouse sign near oats, flier grasses, thistle. Total score: 13 Reithrus, 14 Peromyscus, 7 Microtus, 2 Sorex or nutius, 1 Mus, 1 Perognathus. Some of the Peromyscus were small grey juveniles, one part grey part brown. No small Microtus although one was pregnant. Sept 26 Put 35 Museum Specials at 7 p.m. last night in Tilden at the Microtus-banding place. Baited with oatmeal. Saw or heard several scurrying Microtus while setting and saw one Reithrus or Mus. Two Microtus were caught before we finished setting. Great bored and over nearby. This morning total score was 8 Reithrus, 1 Mus, 1 Per., and 9 Microtus, all except 1 of the 35 traps was spring or held a mouse. Several had been dragged away by a larger animal. No evidence of breeding of either Reithrus or Microtus, all in good shape. Some Microtus with considerable green matter in stomach despite fact that no green grass or herbs are visible in the area. Dillan Beach, Marin Co. oct. 19 Left 1 p.m. with class for Dillan Beach (Benson's manual class) in bus. Arrived Marine Station about 4:15 and set 36 Museum specials in thick tall beach grass and