Gymnogyps californianus April 9, 1946 Hopper Canyon, Calif. +3 toward White Point (where lost). 3:10, 5, apparently from N., over N. Ridge area - 3 from Small Mdw. Pass joined at 3:14. Air calm. 3:15 - saw 2 more at about 5000' level beyond NE Rim. Most glided slowly toward Big Cave area. Saw one close another, twisting in a fast glide. 3:19, 7 circling 500+' above Big Cave area. 3:20 two adults circled over North Point, one with feet down. The same nest #12 next 4 to vicinity of North Creek Falls (at cliff top level) then broke over North slope (3:25). "Return time" about 3:15 today. 3:40, 4 circling over North Ridge and 1 over White Point. 3:45, I saw 7 circling at about 4500' level & 3 over White Cliffs (10 total). 3:55 two adults over North Point descending south- ward. 4:00 - two (same?) headed W. over Old Colin, circled & rose to 500+', then split up, one being over North Ridge at 4:07 & other ?. I walked toward Old Colin to view Big Cave area. At 4:27 I saw 3 over Small Meadow Pass entering Hopper Basin - 4 and at least 5 circling close to Big Cave. 4:38 I saw 2 perched on 41m ledge. Whitewash Ledge, 1 atop cliff over Big Cave, 2 atop Roost Tree, & at least 3 circling near there. The two atop tree flew to ciff, one landing in pothole & 1 on an open ledge. I looked straight into #12 nest - sun was shining in & it was apparently empty. This fact plus seeing no activity there today while especially watching for it leads to the conclusion that the nest has failed. 4:45 at least 8