(408) Sept. 21st. At 8:30 I went to the glade, Brownie and Greenie came out of + the bushes promptly, Brownie using for the next few minutes a low-pitched, plaintive moaning sound (which was new to me) in her talk. Greenie's comments were different, but he adopted this same expression after a few minutes. To keep Brownie from getting more than her share of the worms, I offered them in both hands. While they do not quarrel about them, Greenie still gives way to his mate without contesting the matter. As Brownie is unable to eat two worms at the same time while they are separated by a space of several feet, this system works. When Brownie has enough (temporar- ily) Greenie is not over-awed and takes worms freely. Gather soap-root. Both birds began gathering soap-root fibre again, arguing wordlessly about one particularly attractive ribbon of it, which Greenie had discovered and would not give up. Finally they forgot what they were going to do with them and abandoned them at my feet. It was now time to go to the dormitory tree and see the working out of the rest of the pattern. B arranges twigs in new place. At 8:45 I stood at the tree. Brownie was arranging twigs 6 feet south of her night perch and really working systematically at a nest building operation at that point. (The same one as de- described in the 10:45 entry of yesterday). She got the twigs out of the tree itself. Call this location B and the night perch A. She then moved over to A and got a few twigs for that place. ( Is it possible that these birds build platforms for resting places? I have not seen any). She prospected about the tree for more twigs, then sat within a few inches of A and began to sing very softly. It was now 9 o'clock. She was 9 feet above the ground and about 9 feet from my eyes. She had been working 15 minutes. She then burst B's full-song into full song facing me. This is impossible to describe. It began with a few soft phrases somewhat like worra, wörfa- yer'. ( O as in