being open in consequence) the sound was, nevertheless, modulated and differed but slightly from his regular rattleboo. As he drew nearer the open space in the west lot, he began to display more frequently and with greater animation; the intensity increasing as his distance from the roost decreased. and his pace between displays quickened. By the time I could reach the tree (by a route two or three times as long as his) he was already in his last position in the ladder tree, jumping across the gap a minute or two after my arrival. He had carried the mouse more than 3½ hours. (J. says the mouse was given him at 8:05 A.M.). 5:05 P.M. No rain of consequence since about 11 A.M. I did not look for Rhody until I passed the roost tree at 4 P.M. He was in the house and hard to see. I returned with a mouse at 4:15. He greeted me politely, but wanted nothing. I stayed with him 30 minutes. He was snugly ensconced in the house with tail properly supported--perfectly comfortable (it was warm and sunny) and evidently finished for the day, so I left him. Inquiry of Julio brought forth the information that he had had a mouse at 2:30 P.M.; his indifference was thus accounted for. March 25th. At 7:30 A.M., or a little before, Rhody was heard singing and was located on top of the new house across the street. He was still there at 8:05 when I drove by. (Went to S.F. to photograph ducks at Stow Lake). Julio reported giving him a mouse at the cage at 8:30. At 2:P.M. I was preparing to get fix of humming-birds in the peach tree and Rhody, as he did yesterday, suddenly appeared under the tree without preliminary notice, and began to cry with lowered head. This meant a trip to the tool-house for a mouse, R trotting along behind. He took it with ritual and started for the cage (or mirror) but I had business with the hummers and went in that direction. R, seeing this, changed his mind and followed me to the camera in the orchard below. When he caught up to me he went through his ritual facing me. (I wonder now if he is courting me!). For a few minutes he appeared to make me the base of operations, going off a few feet and then returning to me to display again. He wound up with the mouse in his nest and house in the roost tree at 2:15. About an hour later he was still there. At 4 P.M. he was not. I did not look him up again. This business of following me after being given a mouse has happened often enough now to have some significance. It will be noted, that on this occasion, he actually interrupted the carrying out of a fairly fixed habit in order to follow me. Actually he had nothing to gain by the action and no experience of his, of which I am aware, has taught him that any agreeable consequence is likely to follow it. As he already had been given the mouse he sought and still carried it in his bill, what else did he want from me? March 26th. Rhody was not to be found at 9:15 A.M., but at 10 I happened to catch sight of him on the observatory roof, lying in the sun. In a half hour or so he came down for his mouse, taking it with the usual display, but this time not following me. I did not keep in touch with him further.