Concord,Mass.
1909.
May 16
(No 3)
  As I was passing Dakin's Hill on my way homeward
about six o'clock I noticed a number of birds in
a small swamp white oak standing on the river bank.
Approaching them closely I found they were White-bellied
Swallows, nine in number. They were sitting perfectly 
motionless among some rather densely imbricated branches
about the middle of the tree which was well covered
with small cones. I watched them for some time &
finally left them there. I am inclined to think
that they had gone to roost for the night in this
little oak although they may have left it later.
The sky was densely clouded at the time & the
light already dim.
White bellied swallows roosting(?) in oak on river bank