of the cage and followed at once when I walked toward the shop, where he had his mouse. A half hour later he was up in an oak, where a pair of wren- tits began to wind their rubby ratchets at him. For several days now he has not been seen in his formerly favored acacia. 12:10 P.M. Rhody has not stirred from his perch in that oak. 12:40 " No change. (Temp.73 deg.). 1:05 " " " 1:30 " " " 1:55 " Rhody no longer in the tree, but he had visited the cage and eaten two of the three pieces of meat in his dish. He was not in sight anywhere. Finally I decided to inspect every corner from the outside of the cage when there. However I found him tucked away on an obscure shelf (I had made for A and T, but which they refused to occupy) lying down, tail placed vertically against the wall. An unprecedent location for him and one in which one would not usually think to look. Now I wonder if this has an es- pecial significance. Rhody accurately gauges his stom- ach capacity. At 4 P.M. I came upon Julio trying to induce Rhody to eat a, mouse. Although the bird had followed him to the mouse station readily enough it gazed with indifference upon it. I told Julio that Rhody wanted a mouse but that that one was too large and Rhody knew perfectly well what would fit properly into the vacant space. He wanted a smaller one. So Julio got a very small one and Rhody was interested the moment he saw it coming, taking it at once, eating it and leaving promptly. That was enough for the day. Rhody's eye estimate of the size of an animal that will exactly satisfy his appetite is extraordinarily accurate. This has been shown repeatedly. He does not eat frequently, and never for the mere pleasure of eating. September 17th. B's nesting instinct 9:20 A.M. Brownie has been singing loudly outside for the last hour or so, near the oval lawn. It seems that his nesting instinct is becoming aroused, as he has also been taking small twigs up into one of the trees. Nova singing too. During the whole forenoon he and Nova, who is becoming a more frequent singer, sang frequently. R's meals.today. Too many distractions today to check up on Rhody, but he got meat at the cage once in the morning, once about noon and once about 4:30 P.M. at which time Julio informs me R followed him to the shop-yard for his mouse. Toatl known food: 3 pieces of meat, one mouse. R's bedtime. Allowing a half hour for him to reach his bunk would put him there at about the same time as on the same day last year with the same margin before sunset under similar weather conditions. (Max. temp. of the day 83). September 18th. Rhody, when not hungry, regards lizards, mice merely as interesting exhibits. Rhody made two trips to the cage for meat up to 2 P.M. When he came out the second time he came and stood in front of me, although he was not especially interested in worms. Big mouse refused. When I went to the shop he followed slowly. A mouse was offered. He did not budge. Next a blue-bellied lizard, which played 'possum at once. R did not shift a foot. Next a tiny young mouse. Not interested. All three creatures were now before him at