1905.
May 21
  Clear and cool with high N.W. wind. My registering thermometer
fell to 39 degrees last night and the news say the ground was white with
hoar frost early this morning.
  Arrivals: Cape May Warbler, male; Alder Flycatcher, 1; Nighthawk, 1.
  The country continues flooded with northern migrants
many of which, I think, have been here (individually I mean) since
the 16th although a certain proportion have evidently arrived (and
a certain other proportion departed) within the past two or three days.
The shifting of species has been less marked than that in the relative
number of individuals of the various species and that even is not
very pronounced. The harsh wind of to-day, like that of the 16th,
caused the birds to congregate in sheltered places. There was a small
mixed flock on the slope of the hill below the barn at the farm,
another on the cove to Bensen's, a large one in the wooded run
near Pulpit Rock, a still larger one along the eastern base of
Davis Hill, a smaller one on the south slope of Ball's Hill,
a very large and interesting assemblage in the oak scrub on
the Blakeman Hills next the river and a small gathering
in the flat woods south of Holden's Hill. Most of the
birds seen in those places were evidently north-bound
migrants although some of them belonged to species which breed
here. The weather, curiously enough, did not seem to affect
our summer resident birds (excepting possibly the Tanagers)
for they were found scattered about everywhere in about
their normal summer numbers.
  I made no census of the birds seen on the farm & in
its woods but those met with in some of the other
places were counted as accurately as possible and
noted on the spot. The lists are as follows: