Weston 1946 Journal 21. Joshua Tree Natl Mon.. July 7 - Cottonwood Spring, 3000 ft., Riverside Co., Calif. Sky clear and the air unusually free from haze. We arrived at Cottonwood Spring at 11 a.m. After dinner (lunch) we took a nap and wrote field notes, after which we walked around this locality looking the place over. This place is a real oasis in the middle of hot dry sparsely vegetated hills. 10+ cottonwoods, several mesquite and several palms grow dry at the small flat holding the spring. The spring itself is back in some rocks in a canyon wall. A pipe runs out from it from which a small stream of water runs. It is good drinking water, tasting a little like sulphur. About 5 p.m. I set out 50 Museum snap traps around the bases of catclaw and bushes as well as up in the rocks to the N of camp. At 6:10 p.m. 3 Pipistrellus flew about over the spring. The sun was still shining brightly. The last rays of the sun left the spring about 6:25 p.m. From then until dark many bats were seen flying about the cottonwoods and spring. We (Dr. S.) shot 2 Pipistrellus. A Nighthawk also came in for a drink and was shot at by Wade. Wade missed. Several