Concord, Mass.
1909.
May 15
  Clear and very warm through middle of day but partly
cloudy at sunset with chilly east wind.
  North-bound warblers have been passing in a steady
stream these last three or four warm days but they have
been scattered everywhere through the woods and orchards &
I have seen but few collected in any one place. Nor have
I met with any of the rarer species as yet.
Migration
  Last evening I heard a peculiar cry coming, after dark,
from somewhere well out towards the middle of the Great Meadow.
It sounded most like the er-e of the Sora but was shriller
and less musical, as well as given more frequently & vigorously.
This evening I heard it again, much nearer at hand, as I
was sitting in my canoe in Beaver Dam Lagoon, and at
once decided that the bird must be a Sora with a peculiar
voice. This conclusion was confirmed when I heard what
seemed to be the same bird give the typical whinnying
call of the Sora. The er-e was given only a dozen
times or so, at wide and irregular intervals.
Sora Rail