E.L. Karlstrom 1954 Buffer corvus (18) May 27 0.2 mi. NW Kaiser Pass Summit, Fresno Co., Calif. filtering of sun's rays through pine canopy. Doggy meadow soil under log. Temp. under log beneath wood 2.4° C. Air temp. 1" above its position 1.6° C. meadow surface frozen here. Wood could right itself but otherwise did not respond to my prodding it. I returned to clean up my camp about 8:15 A.M. The corvus first started calling about 8:45 A.M. (D.S.) as the sun hit the meadow surface. Calls were intermittent and not rapid trills at first. I tried unsuccessfully to record some of the first calls but the owls would cease vocalization. Air temp (clouds cleared) 1" above ground 9:30 A.M. was 5° C. By 10:30 - 11:00 I was recording and did take air temp. until 11:15 A.M. at which time it was 11° C. over large meadow grass. The recorder was set in position about 45 feet W of of the edge of the lodgepole pines. I was able to move the whole works forward as time progressed. Sound of running water necessitated frequent placing the mike level on forked sticks. Some interference caused by gusts of wind. Robins, mountain chickadees, white-crested sparrow, scrub juncos provide some background clutter from stand of pines S of my position, where the forest projects out into the meadow.