February 29, 1936 50 5. that a flock) these little birds the shaggy completely out of sight I each other or a tree can gradually work along them a grove) thus maintaining a total fringe area of about constant diameter. This, to me, at least partially explains the trickle & then flow) a flock) Bush- tits from one tree to another a few feet away. Probably the first few follow the first one or two because they happened to be close enough to "notice their location" notes. Then after a third or a half of the birds have left, the rest notice the absence of a large proportion) & notes the flow commences; in fact the last part) the flock