and, when I left, four were engaged. On returning about about 10:30 I found everything quiet. This proved to be a rather warm day (Max.88°), considerably hotter than yesterday; perhaps this has some bearing upon the short duration of the convention. Rhody has now, apparently, added another link in the coming-for-a-mouse chain: for now he almost invariably hesitates, before actually reaching the tool-house door, and stops to consider whether he shall keep on and have a look at the owl indoors, or come and get his mouse. Usually, now, both attraction are given proper attention on such occasions, and the problem seems to be: which shall have precedence. He had three pieces of meat today and two small mice. He slept again in No.1. August 30th. No convention as yet. 11:15 A.M. The beginning of a hot day apparently--80° at 10:30. As yet there has been no thrasher convention and almost no can--even distant. Has temperature some bearing? Rhody presented himself for a mouse about 9 A.M. Even at that time he was giving preference to shade. About 10:30 he was in the shade of the north wall of the shop (and office). I went inside and held the stuffed owl up to the window. He raised crest and made head and tail gestures. I lowered the owl so he could not see it. He came up to the window sill and peered in. I raised the owl (about 3 feet from him). He dropped to the ground at once, did not run off, continued to stare up at the window. I went into the adjoining shop, without the owl. He came up to the sill to look in, running along the sill, which is about 12 feet long (a long, low window to distribute north light along the bench). He got tired of this in a few minutes and departed. Rhody seems to understand fully that glass presents an obstacle beyond which he can not go and has never been known to make the mistake of trying to get through it. But, at the same time, he does not appear to be able to gauge accurately (say within fractions of an inch) its distance from him; for, as in the case of his being on a narrow window sill, he invariably knocks the tip of his bill against it when he turns his sidewise, as he does frequently. Rhody seeks the 1:30 P.M. (Temp.85° in the court; 92 in the cage, in shade). shade at moderately high temperatures. Rhody, in the shade not far from the cage, reacts to temper- ature conditions by standing with bill open, panting; but he remains bright, active, and attentive to passing events. As a resident of the Bay region he would undoubtedly find conditions trying in the areas where most of his tribe are to be found. Rhody stayed home all day and had one more mouse: a rather large one, which he had to reject once hastily (because it either bit him or kicked too hard) when it was almost out of sight in his gullet. He considered it doubtfully, but waited for it to die and allowed a good margin in addition, then swallowed it with ease. There was no thrasher convention all day and these birds, if present, were silent. A light afternoon breeze from the ocean held the maximum of temperature down to 84°. August 31st. Thrasher song was first heard at 5:15 A.M.; a much cooler