him ( I think about 20 feet away) and, for several minutes there was a duet, each singer, however, following his own ideas as to what the tune should be. Brownie mocks Russet-backed thrush. At 11:00 I put fresh soft-food in the dish in the glade, seeing neither thrasher at the moment. As I went out I looked back; Brownie was running up to the dish. As I moved away I heard the song of the Russet-backed thrush coming from the direction of the glade. I thought might that this was one song that the thrashers did not mimic, as I had listened and suspected it once or twice. and hoped for it many times. I went back and Brownie, who had finished eating, came out into the open where she could see me plainly and repeated the song several times. There can be no doubt of it. Those who know song that of this song know that it has a timbre possessed by no other bird but a thrush--in this region at least--and a spiritual quality that makes it unmistakeable. I would say that about all of the song was included but the last three or four notes--that is the notes that are seldom heard in the thrushes own rendition unless the bird is very close. B. repeats thrush song. 3:30 Brownie and Greenie gave very fine exhibitions of sub-singing almost continuously from 1 o'clock. Brownie in the presence of a visitor- of whom she was rather shy, repeated the thrush song and it was recog- nized as such by the visitor. September 3rd. Mutual rela- tions. About 8:00 A.M. both thrashers were at the oval lawn. Greenie came for worms first and there was no interference by either bird with the other. There were a dozen or so fresh thrasher feathers on the lawn and when Brownie came to me one or two fell from her as she ran. About 9:40 the two were in the glade; I was watching them from the outside, because as they were making a peculiar sound I wanted to see if there was any special reason for it and did not care to risk disturbing them. I could hear two thrashers and see only one; but that one was not silent. That meant three thrashers. Another thrasher appear-