Concord, Mass.
1911.
Oct. 30
[October 30, 1911]

  Clear calm & deliciously warm with little or no wind.
Last night cool and country white with hoar frost at sunrise this morning.

I note for the second time this autumn & for the third
this year a mysterious bird, possibly a Wheatear!

  It must have been twelve or fifteen years ago and either
late in October or early in November that I saw and heard a
bird then and still unknown to me, flying high in air over
Great Meadow, calling whit, whit very like a Least Flycatcher.
Since then I have repeatedly seen and heard others of the
same kind, invariably in this part of Concord, always on
wing, nearly always in late autumn and, with but one
exception, singly. About two weeks ago (I neglected to
note the date) I heard this call early one morning at
Ball's Hill, evidently coming from high in air overheaad but
I failed to catch sight of its author on that occasion.
I heard it again this morning (about 8 o'clock) as I
was standing in front of our farm house. The next
instant I saw the bird and to much greater advantage