dense bush overhead, his white belly having attracted my attention. I was not able to identify him by that alone, it being necessary to shift about to get a view of his upper-works. During this time he remained absolutely "frozen", and I left him in peace. May 15th. There was some wandering, early morning song. Both thrashers spent most of the forenoon down in the canyon to the west. As determined by feeling inside of it, the nest seems to be practically completed, although up to the time of the laying of the first egg, the birds usually add a fibre or two now and then. About noon the road-runner was prowling about the lath house. Donald Brock advises that the second thrasher nest which he had under observation contained 4 eggs, and that the young have flown. Something destroyed the first nest. Mrs. Grinnell, Miss Blanchard and Dr. Grinnell came during the afternoon to see the thrashers, but B and his mate persisted in staying down in the canyon and were not even seen, except by me earlier in the afternoon. Perhaps they were taking a vacation as a preliminary to the serious task ahead of them. Neither bird was seen at the nest all day, and I have been wondering whether Nova's apparent preference for the canyon might induce B, in his infatuation, to abandon the present structure and build down there. May 16th. Early morning song was heard. About 9:30 I heard Brownie's contact song and went out. He seemed a little shy at first, but soon was on the usual familiar terms. His mate must have been near, as he as if frequently went into the bushes to confer with her and made short visits to the nest as if trying to induce her to follow. This is conjecture. This morning his music again differs from that of the last few days, in that the ka-dah-cut and the cut-cut-ka-dah-cut of the hen have reappeared. 10:15. B was sitting quietly in the nest as I passed by, but