izing influence of water vapor upon temperature of air). (Badly expressed, but the germ of the thought is there). I now went to look at the thermometers in the court and found they agreed at 66 deg., with but slight variation. I found that Rhody had followed toward the house, and was now sunning his back -for the first time since 3 P.m.--at a point where presumably, he could not fail to observe me in case I took any action on the mouse question. I walked right on past him,as he lowered his head and cried, to the tool house, where he joined me and got his mouse . He now proceeded down the lower road, stop- ping frequently to perform his ritual, and out the side gate. I followed a minute or two later and found him on my side of the street, and heard Mrs. Scamell talking to him from her house. II went across and stood on their walk, Rhody retreating and emerging from the brush on my bank for each passing car. I wanted to give Mrs. Scamell a demonstration of how easy it is(for one who knows the habits of a certain animal fairly well) to convince the uninitiated that that animal understands what is being said to it (and hoped it would work!). I therefore called to Rhody from across the street:"Come over here and look at the nice automobile." (Knowing that (a) when he is carrying a mouse near the Scamell house he is attracted by re- fections in their front windows,and/or, their roof as an observa- tion point).and (b) that from that side of the street he can get a better view of the field on each side of the house, so that he is inclined to cross the street at that point anyway (c) he likes carsHe did come , and stood behind a car parked at the curb and stopped. I now said to him:"Rhody, move four feet to the left and a little this way, and you will find a bright hub-cap--(Know- ing, of course, that he is inquisitive about motor cars--and es- pecially likes to look at the hub-caps --reflections). Naturally he did just that. I said (at the proper instant): "Now show \the mouse to the bird, bow, wag your tail and say hroo-o-o". All of which he did, because he was going to do that anyway. I now said: "Go under the c ar". He did, because he often does and I did not give the order until I saw signs of his intention. March 8th. At 8:15 A.M. Rhody was at his post. When I spoke to him he pick- ed up a twig, soon dropped it, then walked off. He has done the same thing before with this same twig when I have spoken to him, during this: the mating season. During this same season--though not the last few days--his response is often to begin his song. This is a modification of the behavior, discussed in detail Dec. 14th., pp 1314 --20, when called at this same post, but at a time when his sexual impulses were dormant. This was a bright and sunny day with temperatures running in th the low seventies. I had little time to devote to Rhody, but looked for him casually two,or three times without seeing him, until 4:30 P.M.. I then heard Julio talking to him and found that he had made application at the tool-house for a mouse. The impression gained was that he had been devoting most of his time during the day elsewhere. March 9th. Warm rain during the night and threatening still (9:30 A.M.). Rhody was found at his post at 8:45 A.M., with wings drooping-- a pose he often assumes when slightly damp.