for a similar period, then pounded it on a rock. He did not re- -treat to the inner cage, even when Rhody left him and hung around my feet. This action of Rhody's meant, of course, that he wanted another mouse. He followed me to the tool-house door; there to look in at me through the window. Again he tried, not very persist- ently, to reach the mouse through the glass; but when I went to the door, he was there about as soon as I. I looked once or twice during the afternoon to see if he might again be at the cage, but he was not. Part of the time he spent in the orchard. R5 seemed to be satisfied with two mice today, and also seems ka more or less to be on the lookout for Rhody's coming part of the time. At least he watches him go and stares after him long. The hummers do not object to visitors at all. As yet they have shown no antagonism toward each other. Even when roosts momentarily on the others bill, as often happens, no resentment seems to be aroused. Their droppings are discharged so frequently and with such force that they can be heard striking the paper floor of the cage at a considerable distance. Inasmuch, also, as the act is perf- formed without reference to the location of the other bird at the time, and both as yet, have failed to bathe, it may be wise to separate them for this reason, if for no other. Weather "relapses" About noon, skies still clear, the north wind resumed, sending temperatures down again, further delaying recovery from this unprecedented, long cold spell. January 25th. Sunrise revealed the heaviest white frost seen at this place, with minimum of 30 in the court. (White frost because humidity). Humming-birds' narrow Before I was up Julio had discovered the humming-bird cage, escape from death by ants. the birds' food and the birds themselves swarming with Argentine ants. The ants were in their eyes. Yet the birds were in the liv- ing room where only an occasional ant has ever been seen. He at one transferred the birds to another cage after removing the ants from them. They had apparently been unharmed. A narrow escape from this really serious menace to all bird life in this part of the country. During the day the birds were placed in separate cages and the cages put on a stand with its legs standing in dishes of water. The ant scouts will presumably report to headquarters that the cages are inaccessible. Later in the day, while verifying the presence of Rhody in his roost, I passed along the sidewalk at the street and I counted 42 (!) separate streams of Argentine ants crossing it, in a dis- tance of less than 100 feet. Each stream contained ants going in both directions. Calibration of Thermometer in Court. For several days I have had three high-grade, etched stem thermometers fastened alongside the registering maximum and minim- um thermometer in the court. These three thermometers agree with each other at all temperatures within the recent daily range, with- in a small fraction of a degree. A complete calibration has not been made, but within the limits of the daily range, it was found