his place and was shortly relieved by N2. June 17th. At 6 A.M. the hummer was on her eggs. At 7 A.M. Rhody came to the dining-room window to remind us of his continued existence and his desire live still longer; so he was given a mouse and was shortly back in his house again. At 7:45 affairs seemed to be progressing satisfactorily with the thrashers--no ants at the nest--the chick still there. Hummer still adds The hummer was now seen to add material to the parapet of her nest; presumably raising it?). The outside is now fairly well covered with lichens. She still compacts the structure by "jig- gling". It is possible to distinguish between this action and that of rubbing herself down upon the eggs. Rhody sings in At 10:30 A.M. Rhody was much interested in some weeds near the cage, but when I passed by, trotted along behind to the tool- house where he was given another mouse. A ceremonious journey to his house followed. There, after a few preliminary hroos and coos he worked up into full song, with the mouse in his bill, attaining to ten successive coos. The mouse was then eaten and he settled in his nest. (Well, here he is looking in at the window. He goes to the roof, scolded by a house-wren). June 18th. and 19th. Little change in behavior of birds under observation. Hummer. The hummer, on both days, added material to the nest, both outside and inside. Outside mostly spider webs; inside cottony stuff, usually just inside the rim as if increasing the bulge in- ward there. The exterior is now well decorated with lichen and "moss". She continues to drive other birds out of the tree, having now added a thrasher and a house wren to her list of undesirables. Unlike the thrashers, she leaves the eggs uncovered frequently. Thrashers. The thrashers are attending to their single chick well and, unless my recollection is at fault, are hovering it more than former broods. Neo has relapsed into almost complete indifference toward me--never seeking me and not caring much about taking the worms tossed to him on the rare occasions when he is seen off of the nest. Rhody. Rhody relaxed somewhat in his "incubation" and was out of his house more. He occasionally picked up twigs only to drop them and still investigates prospective nesting sites: the latest being at least 30 feet up in a Monterey pine. June 20th. and 22nd. During this period affairs remained static. The hummer continued to add material to the nest occasionally. The thrashers continued to keep their one offspring covered most of the time and showed no interest in me whatever the few times I attempted to engage their attention. Rhody again, once, sang in his nest while holding a mouse in his bill there. June 23rd. to 25th., incl. I was absent during this period, but Julio says that the