The outside of the nest is, at present,"decorated" with an alga--the fibrous sort, such as grows in pools. From the side from which observations are made (S.W.) only one flake of lichen can be seen. A nest of the Allen hummingbird in Redwood Canyon, which is being watched, is liberally spotted with lichen, the effect being-- after the nest is once located--to make it conspicuous instead of the opposite. During the rest of the day the bird here was frequently away from the nest for extended periods, but occupied it during the night. Rhody continued to make nest-sitting his principal occupation of the day. The thrasher nest was not seen without an adult sitting in it. June 15th. At 6:25 A.M. the hummer was in the nest. At 7:30 she was out and two eggs were visible. Therefore, one day intervened between the laying of the eggs. 11 A.M. The hummer seems to alternate incubation with continued work at the nest--still adding material to it. There are now a half dozen or so conspicuous flecks of lichen on the S.W. side (toward the window). (The Redwood Canyon nest is much greater in bulk. It also has a tumble-home to the sides and the one youngster in it is secured against falling out). Rhody's feathers are now to be found all over the place: even on top of the chimney, where he favored us about 8 A.M. with a series of rattle-boos. About the middle of the afternoon he was found up in an oak by the tool-house door struggling with small branches in order to clear space for a nest. He has examined this tree several times in the last year or two, apparently considering it as a nest site. On the present occasion he came down for a mouse after working a few minutes longer. With the exception of this incident, his daily routine was unchanged. June 16th. The Allen humming-bird continued to incubate and add to the structure. The material included spider-webs, lichens and something looking like cotton. Rhody continued true to form. At 7 A.M. Julio found that ants had invaded the thrasher nest and that there were only two chicks in it. He removed these temporarily and sprayed the surroundings. About 5 P.M. I found Neo in the nest and offered him worms, which he would not take, even when they were laid on the rim of the nest. A little later it was noticed that ants were crawling on him and one was in one eye. He would not leave the nest until I lifted him out. During this process he pinched a finger but, curiously, clasping a worm still on the parapet reached out and ate it while still in my hand! There was only one chick left, which I removed in order to give the nest itself a good spraying. Neo had popped back into the empty nest and sat there solidly, so had to be removed again. The job finished and the chick replaced, Neo resumed