the food. As this is the first time he has been seen apparently satisfied with the size of his catch, for the first time it occurred to me that perhaps there is some sort of an instinct at work within him which causes him to gather a supply of food such as would be suitable for nestlings, if he had them. In other words, this carrying behavior,in its latest manifestation, now may repre- sent the working of an instinct which warns him that sufficient since he began calling a mate time has elapsed A for there to be young birds to feed. The horizontal tail-wagging is just like that of an interested it or happy dog and the first impulse is to ascribe to the same emotions, and perhaps it should be. Why not? Although the door of the cage was opened, the mocking-bird did not come out. The door was closed for the night. March 25th. 12:30 P.M. R was heard calling about 7 A.M. He visited the cage and played with the mirror by 8 A.M. Mocking-bird. out and in. The mocking-bird decided to come out of the cage, but by 12:30 was back in again. He was in and out several times during the day, being inside at nightfall when the door was closed for the day. The certainty of finding food in the cage evidently appeals to him. This bird has never been tamed; no effort having been made in that direction. No full song heard from B, who continues to do most of the feeding. March 26th. R's early song. Rhody began his morning song (or at least was first heard) at 6:15 A.M. from the observatory roof. Until 10:15 A.M., when I left not to return until 5 P.M., he spent practically all of his time on the roof calling. Mocking-bird. The mocking-bird was out of the cage at about 9:30. Julio reports that he returned shortly after I left, and stayed there.