large branched tunnel, not cold, no bats in it but might be good summer roost or night-roost. After lunch went to [illegible] Red Elephant Mine for first time. Both shafts were full of water. Several old houses but not good roads. Then went to Harrison Mine. The only [illegible] found were two in a gulch well down below the old mill. Both were small [illegible] (adits) but are 3 and the other 2 Cory; one of each was a barred one from Manhattan Mines. Mary looked in the two Red Mine tunnels above the road and I looked in the one below the road. The entrance to this one had caved-in, leaving a just-enterable slit, but the cave-in had [illegible] dammed up the little stream that used to come out of it so that it is now waist-deep in water. Home about 10 p.m. All bats were barbed & released except 1 Harrison Mine bat that escaped without barbing. Tilden Park, Contra Costa Co., Calif. Feb-18 In late afternoon put 50 Sherman traps [30 byrne, 20 by adits] in grass and corn on slope across from Camp Podre. A few signs of marmots and brush rabbit Feb. 18 Caught one 3 adult marmots and 10 Beathors. One Sherman held 2 Beathors, a ? and a ? Feb. 25 Put Shermans on slope across from Camp Podre. Mined all along edge of Artemisia, adits' all in Cornice.