Concord, Mass.
1906.
Aug.19
  Clear & intensely hot with light S. W. wind.
  A rather large mixed flock, composed chiefly
of Warblers, spent the day on Ball's Hill ranging
along its entire length and chiefly frequenting the
trees at its base on the banks of the river. They
appeared near the cabin about 10 A.M. and descending
to the button bushes outside the outer line of maples bathed by (?) in the shallow water among the stems of these bushes. While thus engaged and a little later
when I attracted them close about me by "screeping" I
had good opportunities for counting or closely estimating
the numbers of the flock. It contained 4 or 5 chickadees,
3 or 4 Red-eyed Vireos, 4 or 5 Black & White Creepers, at
least three Nashville Warblers, a beautiful male Golden-wing with
full black throat and other markings of the autumnal plumage,
4 or 5 Black-throated Green Warblers, 5 Chestnut sided
Warblers, a pair of Blackburnians (both apparently young
but in full autumnal plumage) and a female or young male Redstart.
None of the birds were seen about the hill yesterday nor
could I find a single small bird of any kind elsewhere
to-day at least in the woods which I examined rather
carefully on my way to the farm in the afternoon.
Mr. Forbush, who has been spending the summer at
Ball's Hill, tells me that this is the first flock of
Warblers of any size that he has seen there. I have
little doubt that they came from further north although
all of them belonged to species that breed in my woods.
Shortly after dark this evening and late into the night
I heard Warblers calling in the air overhead but
the flight was not a heavy one, apparently.