Peterborough, New Hampshire.
1898
July 5 to
Aug. 15.
(No.13)
  On July 23rd I found a mixed flock containing besides a
number of Chickadees and Kinglets, several young Nashville, Chestnut sided,
Black & Yellow and Black-throated Warblers all of which
were in autumnal plumage. These Warblers were no doubt
reared in the vicinity but where were their parents? I
looked the flock over very carefully and made sure that it
included no adults of any of the Warblers just named. This and
other considerations led me to believe that prior to this
date at least some of the old birds had already departed
southward.
[margin]Migration[/margin]
  The first unmistakeable [sic] evidence of migration occurred, however, on
the evening of July 29th when I heard Upland Plovers passing
over at 8.30 and again at 10 P.M. and a Warbler of some kind
at 9 P.M. The night was foggy and warm.
  The next flight occurred on the night of August 2nd when the
weather was clear, still and very warm with a full moon.
Upland Plovers were heard at 8, 9 and 10 P.M. as well as just 
before daylight the next morning. From 8 to 10 P.M. Warblers
were migrating in great numbers their lisping calls being heard
every few minutes. I could detect no northern birds and no
additions to the numbers of our local birds the next day but, on
the contrary, there was an apparent diminuation in the number
of the local birds. From this I infer that the flight did not
come from far to the northward but simply drained the local
fauna.
  On August 6th, a clear warm night, a few Warblers were heard
passing overhead between 8.30 and 9 P.M.
  On August 9th Warblers in considerable numbers were migrating
from 9.30 to 10.30 P.M. The night was cloudy and calm.
August 10th to 16th. Warblers heard in small numbers
about every night. No considerable flight during this period.