(405) Greenie had eluded me once more, although I doubt if it was intended, since Brownie is quite open about the matter. Still the two birds have distinct personalities. Sept. 20th. 9.00 A.M. About 8:30 I went out to look up the trushers. Calling brought no response, but as I left the glade, Brownie was seen coming rapidly towards me and Greenie further to the north was in the act of rolling a large stone out from under a loquat tree. After satisfying Brownie's appetite (Greenie wanted nothing), she climbed the old oak and called loudly, then volplaned to the ground by the dormitory tree. I went there to see if she was so fatigued as to need repose at this time of day, and found her in her night perch arranging twigs which she must have carried up! To complicate matters further Greenie joined the party, gathered nesting material, carried it up into the tree and joined Brownie. While they did not seem disturbed by my presence, I left to avoid any possibility of interference. Looks serious, but think not genuine. This seemed like a bona fide nest building effort in every respect, yet I cannot think that it is. If it should be, it punches my yesterday's deductions full of holes. Amateur analysis It will be noted that the apparent stimulus here was satisfaction of the birds' immediate requirements for food, leaving them with out pressing needs, in other words--idle. During the normal nest-building season, as the notes very definitely record, giving food to the birds at times when they were not actually engaged on the nest work, usually (perhaps the notes will show invariably) set them to work again, even when the point at which they were given food was far from the nest under construction. At 9:50 Brownie was in the dormitory tree about 6 feet from her night perch, moving slowly about in the branches. When I arrived she moved over to a point directly over the perch and began breaking off dead twigs and dropping them (perhaps three or four). Most of them