(89) very much softened, but perfectly rendered as to pitch and rhythm. (Incidentally the Steller Jay's perfect imitation of the Red Tailed Hawk does not seem to disturb any birds at this place)- I have noted this many times. (10:45-raining again--alternate sun and shower). 10:48--hail. Julio, who is much interested in the garden, wants to know if it will knock the caterpillars off of the trees. April 18th. 10 A.M. Everything proceeding according to the usual routine. Green-eyes interested in worms but not in soft food. He relieved his mate at the nest, whereupon she came promptly for food. April 19th. Green-eyes off duty at about 8 A.M. at the oval lawn. No further observations this day on account of absence. April 20th. At 10:50 Brown-eyes was eating worms and soft food from my hand. She withdrew a few feet and sounded the first few notes of typical thrasher song, then went to the nest, Green-eyes coming through the hole in the fence and running off into the bushes in the glade. I looked for him without finding him; but in ten minutes Brown-eyes appeared in the glade, so I went down to the nest to see if it was occupied and it was. This was then a very short shift. Meanwhile a thrasher song sounded from near the top of the old oak. This was full song and on inducing the bird to come down it proved to be Brown-eyes. Both of these birds have now been observed in definitely been sung full song from a high perch near the nest, for they have each been kept in view at least once continuously while either coming from the perch where the song was sung to my hand, or vice versa. If it be granted that these two birds are of opposite sex, then it may be stated that both sexes sing full song. A few minutes after the foregoing observation was made it was repeated with the same bird.