Rhody's moul.t. It was observed that his scapulars, wing coverts, etc., as was the case last year at about this (?) time, have lost the sharp tips of the individual feathers and his tail is now made up of feathers no longer uniformly graduated in length, with some miss- ing. About 5:25 Rhody came down from his tree and rattle-booed (to attract attention). He gradually strolled toward where I sat in the shade (80°) occasionally rattle-booing softly. He moved about circumspectly close behind me in the shrubbery booing again. I knew what he wanted, but waited to see what he would do about it. He started for the mouse place a couple of times, each time returning. Finally I yielded and we got the mouse. This was killed and eaten at once, which has lately been his practice. This and his wandering abroad, with neglect of building operations even on new construction is interpreted as presaging the fading out of his mating urge either for this particular "harmonic" of his nesting cycle or for the fundamental wave of the season. (At this point I looked over last year's notes for a few days each side of this date. I had not read them in the meantime. He is repeating himself! More--those same notes call attention to his having been doing the same things in 1936!). I have not looked up 1936; but for 1937, the 1938 notes for this season, of the year apply almost precisely--even the lost feather-tips are recorded there with the increased wanderings, neglect of newly started nests and selection of the acacia tree for the same reasons as advanced here. It is almost uncanny). Also almost complete cessation of mouse-display, per- haps the most prominent symptom. After having his mouse Rhody returned to the same acacia, despite the fact that the sun was now off of it, and at 6 o'clock when I left, was still there. (I do not remember his doing that last year). This did not seem to fit in altogether with the Light- and-shade hypothesis as sole cause of his selecting this particular tree, so I went and had a look at him. I found him on exactly the same branch (or branches) as he used last year, as was soon evident, for the perch selected consists of two small parallel branches in contact with each other and horizontally disposed. They are of such a size that he grips both with his feet, thus securing firm support without too much muscular effort and, at the same time, a two-point contact for his breast-bone, giving added stability. August 1st. Rhody was not seen here until about 9:30 A.M. He was then removing loose feathers while sitting on a lath screen over a rhodo- dendron by the Dormitory tree where the glass house is. He came down for a drink then, seeing me trying to chase a young spotted tow- hee out of the cage, he came over to "help" by trying to get at the bird from the outside. This proving disappointing, he started in through the open door just as the youngster flew out. Rhody follow- ed him to the glade swiftly, but when the towhee stopped there, in plain sight, did not attack him, but wandered off gazing up into trees, finally winding up in the "Optimum acacia" (see paragraph above) where he settled for a rest on his double roost. (74°). 3:15 P.M. Temp. 86°. At this temperature Rhody finds that he needs complete shade, preferably with a breeze. The optimum tree admits too much sun. For about two hours and a half he has remained in an acacia at the east end of the cage where he gets deep shade and a breeze. Occasionally he puffs even under these conditions. A ther- mometer, which has been checked with the one in the court, and which