(207) Without attempting to be exact, but without serious error, it may be said that these young birds were hatched in about two weeks, stayed in the nest about 18 or 19 days, could not fly for about 3 or 4 more days and are now about 28 or 29 days old--say one month. About 10:00 a luckless California Jay invaded the premises. As I was trying to locate him, about 6 Brown Towhees and 2 robins chased him out of the pines into another tree, then toward the old oak where they were joined by both Brownie and Greenie. I could not see everything that happened, but they got him down on the ground and he cried piteously. Feathers were drifting along the course of his previous flight and they were not all blue jay's eather, although they had established frequent contact with him in the air. Brownie soon came out of the melee with feathers awry but quite calm, as she came to me for worms without being called. It is impossible to enumerate all of the birds that joined in the pursuit, but I saw and heard along the route of battle, the following birds: Wrens, Plain Titmice, Purple Finches, One Hummingbird, Brown Towhees, One Spotted ditto, Lawrence Goldfinches, Greenbacked Goldfinches, Wren-Tits. Robins. The Brown Towhees and Thrashers were positively engaged, the others flew into the route of battle and if they did not get into the fight they encouraged their allies by voice and presence at least. The dis- tance covered with twists and doubles was, perhaps of the order of 300 yards, and the wind-up was about 30 feet from me. I searched the spot after it was all over but the Jay had undoubtedly decamped. This spot is marked by a dense clump of baccharis sprouts coming from the stumps of bushes that had been cut off and, curiously enough, witnessed the close of a similar pursuit a couple pf months ago. 10:40, as I set the camera up, the young thrashers came swarming out