neck whence feathers radiate in all direction when the bird is warming its back appear to contain more white in Rhody and more tawny in R5. About 3:15 P.M. I gave Rhody another mouse when he was at the cage, R5 observing the operation and wanting one himself, as evi- denced by his coming up behind me in order to get it himself. Rhody would not come in and was little interested in R5. The same indifference was shown to R by R5. Rhody took the mouse to the mirror without offering it to the other bird, held it a long time, wandered 'a little, with some display, then took it to 2-36. I then gave R5 his mouse. After eating it he became quite lively, pulled off a few circuses, some of which were initiated by first peeking at the magpies from behind a bush, coming back to repeat, etc. The magpies, especially when down on the floor of their cage, are beginning to be recognized by R5 as part of his cosmos. Rhody was not heard to sing during the day. Brownie did not work here. February 25th. Nothing of especial note during the day. Alternate rain and sun Rhody was not seen to work at 4-36, though he entered it twice (was seen to enter it twice--but I did not watch him all the timé!) as for inspection. On one of these occasions he took nesting material from within 2 feet of the glass house and took it to 2-36. February 26th. Early morning hours bright. At 8:45 R was at the mirror with pine-needles. R5 in outer cage sunning, not appearing to notice R. R took the needles to 2-36. In a few minutes R5 rattled-boed loudly from the upper annex as if aware of R's departure and commenting thereon. I was watching R at the time and he did not react visibly to the call. At 11:30 A.M., I went out again to look up Rhody. He was work ing actively on the nest in the glass house in the dormitory tree. I was beginning to fear that he had decided against this one, since he has only been looking at it lately, confining his work to nest 2-36 instead. However, he kept busy until about 12 o'clock, and was taking up large quantities of nesting material and placing them carefully in the nest. He now took a rest in the nest for a few minutes, then sailed down to the cage where I was sitting,R5 and him at the same time. R5 could see him working at the nest and had been watching quietly. I now went into the outer cage with R5, opened the door and Rhody came in to take the live mouse offered. R5 had gone up to sit in the sand-box which is placed in the south-east corner of the inner cage about 4 feet above the floor. Rhody bowed, hrood, wagged his tail sidewise in the courting gesture first observed in 1935, and walked in to the inner cage. He jumped up into the box with R5, who was now lowering his head, wagging it from side to side and crying, and crowded up against R5 (first time noted) head beside R5's, both facing in the same direction. Rhody touched the side of R5's head with the mouse. Clearly a direct offer,and the first observed. R5 would not take it. R now made a movement as if