Weston 1946 Journal July 4 Quail Spring, Joshua Tree Natl Mon, San Bernardino Co., Calif. around the bases of scattered catclaw trees in the wash NW of Quail Spring. After doing this the three of us went up to the spring to watch and catch some bats that drank here each evening. Several shots were fired at them with .22 shot shells. Wade hit one Pipistrellus with my gun. At the spring our threads and wires were still strung across the water. Occasional Pipistrellus hit them and fell into the water. We did not attempt catch all of them. The Pipistrellus are the early or twilight-flying bats. Later in the evening, around 7:30 the Eptesicus appear, only as scattered individuals however. Wade and Dr. S. ran several experiments during the evening on the effect of light on the drinking by the bats. I did not get all of the details and reference to their notes should take place when working on the bats of this area. Back to camp so at 9 p.m. I ran my trap line (55 traps) before going to bed. I Got 3 Perognathus, At 9:30 p.m. I went to bed. Tonight Dr. S. tried to whistle up a screech owl we heard the other night but had no luck. July 5. At 5 a.m. I got up and ran my trap line. Out of 55 traps set out I caught 1 more