Concord, Mass.
1911.
Sept. 20
[September 20, 1911]

  Clear and very warm with light northerly wind.

Small birds very scarce
Good flight on 16th
Wilson Blackcap.
Migration during rainy misty night.

  I have been here most of the time (but not continuously)
since September 12th, living at the cabin on Ball's Hill.
Small birds of every kind have been thus far for the most
part exceedingly scarce but there were lots of them on the
morning of the 16th when, in the woods at the east end of
the hill, I saw a Black-throated Blue Warbler ([male]), a pair
of Redstarts (the [male] adult) a [female] Wilson's Black-cap and several
Black-polls besides other Warblers not definitely identified.
All these must have come from the south during the preceding
night for the day before was a peculiarly bird-less one. Yet
the night just mentioned was cloudy & misty with heavy
rain falling east of the town. The rain began about
3 P.M. on the 15th and was accompanied by fresh
south easterly wind which made the air seem chilly
although the temperature was not low.