1773 December 10th. The weather had recovered its sunny aspect this morning. Early thrasher singing. At 6:50 A.M. fine, full thrasher song began and continued intermittently for about 20 minutes, perhaps longer. In other words: It began before sunrise and stopped at approximately sunrise. Rhody discovers humming- bird pat- ient. Rhody had not been seen during the forenoon, so, at 2 P.M., I went to the west fence and called. No results. But almost as soon as I returned to my construction job in the observatory, Rhody appeared in the upper garden and was inspecting the humming-bird patient at uncomfortably close quarters (about 2 feet from his cage temporarily in the garden). I went down quickly. Rhody seemed merely "academically" interested in the hummer, but I thought best to bribe him to come to the tool-house. Consequently I followed me the door that opens into the court--an unaccustomed place for him to get "hand-outs" from me. Here he was pleased to take two small mice from hand and then sun himself in the location whence the hummer had just been removed to a safer place. Reaction of hummer. Sooner or later Rhody always discovers my patients, as these notes bear witness. Hummer a little disturbed in R's presence. He again slept in No.1 Screech-owl discharged. This bird seemed perfectly normal--also was seriously depleting Rhody's mouse larder--so was taken up into the hills to the east, house and all and placed in a pine tree (Lot 2031, Scarborough Road, Oakland). He was still asleep in the house when I put it in the tree. This is the fourth screech owl I have carried up into the hills and furnished with a house. All of them have slept during the journey. Alice's dormouse was an insomniac compared with these owls. December 11th. A strong north wind arose during the night and the day dawned crystal clear. Quail kills herself in my sleeping quarters. A little before sunrise I heard a slight scratching sound near the radiator and it was seen that a female quail was huddled against the inlet valve. (While the radiator was not turned on, the pipe below the valve for about 6 inches in length would be hot at this time of the day. Later droppings showed that the bird had confined itself to this location for a considerable period). The bird took flight when I began to move about the room, circling about the ceiling and not approaching the windows (one of which was open--on the sunrise side) as if knowing or believing that the windows offered no means of egress. This would seem to indicate that it had had experience with windows and had learned to avoid them; but when it saw that the door leading to the dressing room and the bath room was now open--it had been closed all night--it dashed swiftly through it and a loud impact sounded from the latter room. The bird was on the floor quivering and was dead in a few seconds. This suggests that she had previously tried the bedroom windows, found them (supposedly) impossible to get through; had learned that they were impenetrable, but had not formed the same association with all windows; hence when a new window was seen for the first (?) time, dashed to her doom. Reaction of hummer to dead quail. Later the quail was shown to the humming-bird in his cage. The reaction was essentially the same as toward Rhody yesterday: That is, the hummer began at once to fly about the cage, shifting from perch to perch (but not beating against the