Concord, Mass.
1900
May 30
Ball's Hill
  Clear in A.M., cloudy in late P.M. Strong S.W. wind.
Ther. 48 degrees - 78 degrees.
  The only northern bird singing near the cabin in the
early morning was a Black-poll Warbler; but immediately
after breakfast the male Mourning Warbler which was here yesterday
appeared again in front of our door and on taking on walk
along the river path to the bars and back around the E. end
of the Hill I saw or heard 3 or 4 Water Thrushes, about a dozen
Black-polls, 9 or 10 Canadian Warblers, a male & female Wilson's Black-cap,
and 2 Traill's Flycatchers (one in full song).
Alder Flycatcher
  Another and longer walk taken in the early afternoon
(to Davis's Hill and over Pine Ridge) added nothing of
interest to the above list. Indeed, it only seemed to further
establish the fact that most of the northern migrants
which were here yesterday continued on their way last
night & that no additional birds came from the South
to replace them. It is evident that the migration is
fast drawing to a close. It has been in several respects 
the most remarkable spring movement that I have ever
witnessed. In the first place it has been practically continuous
from May to yesterday, there having been during this period
no days where the country was not alive with birds. Their
numbers on the best days have been simply unprecedented &
have attracted general attention & comment on the part of
persons not ordinarily attentive to such matters. This
unusual abundance has not been characteristic of a few
species only but has been very general at least among
the birds which breed further northward and especially
among the northern-breeding Warblers. Almost the only
exception to this which I can think of is in the case
of the Solitary Vireo of which I have noted only one
Most of the
North-bound
migrants
pass on.
Migration
nearly over.
A remarkably 
heavy and
protracted
bird wave
or succession
of waves.
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