extension of the cage. March 14th. Rhody was heard calling about 7 A.M. During the day he made half a dozen visits to the cage; some of considerable duration-- half to three quarters of an hour. He did not fail to give the young birds his usual attention. It seems to me that his interest in them is becoming keener, but this is not certain. These affairs usually begin by Rhody and one or both of the young birds, usually Archie, following roughly parallel courses on opposite sides of the wire; Rhody occasionally displaying, but silent and intent; his vis a vis hahking and excited. After an indefinite time all calm down and rest quietly, placing themselves without reference to each other. Rhody also worked on his nest and searched for a mate. When Mr. Sampson, who called in the afternoon, was leaving I went down to the street with him where his car was parked. Rhody appeared from behind it, unalarmed, with a load of what looked like pine needles and carried them to his nest, openly. There is nothing secretive about him. He had probably been inspecting Mr. Sampson's car, as he is very curious about automobiles when they are not in motion. 8:00 A.M. Well, Archie and Terry are sleeping tonight in sep- arate cages. Terry in his old place in the upper story of the cage and Archie in the magpie cage, the latter being in the outer portion. (The night fair and warm). About 5:40 I noticed that A and T were both restless, but attributed this to a mild fright that they had had when my sister and her daughter came to the cage an hour or so earlier. However, it was noticed that Terry was hahking as if Rhody were present-- something he has never done before unless his father was at the cage. He had also scraped his bill and forehead again, just as I thought I had the old injury on the way to a cure after it had been in bad shape for several months. Rhody was not about. Then I wondered if, now that they are becoming mature, this hahking and restlessness was an indication that he was suddenly aware of some- things about Archie that he had only recognised heretofore in Rhody. The mystery was soon solved by Archie, who delivered a fierce and determined attack upon Terry and pursued him vigorously about the cage. Terry was plainly terrified and injured his bill still more. I stopped this affair temporarily but Archie was persistent, got T in a corner, unresisting, and made the feathers fly. Terry was pitifully frightened and rattle-booed time after time and would not let me touch him. Archie, rather surprisingly, would let me class his body in my hands and stroke him, but it was noticed that he was trembling. At this stage I separated them for the night. Oddly enough, after Terry had kept up his running about and booing while alone in the cage until 6:30 or later, he took, for the first time in many weeks, his place on the shelf in the annex that Archie had taken from him. It is possible, then, that the present disturbance resulted from T's having attempted to reclaim this shelf, and that started the affair. On the other hand, particularly if it is true that roadrunners are solitary birds, it may be that adulthood is now bringing to the surface the intolerance of roadrunners for each other, possibly emphasised by the fact that it is mating season. I do not know at what age they are supposed to reach maturity. In any case they must be at least approaching it. If then their sex instincts are asserting themselves, does this incident indicate