Concord, Mass.
Ball's Hill.
1900
May 6
  A gloomy, depressing day the sun almost completely
obscured by a dense smoky haze, a penetrating west wind 
blowing. Early morning cold. Pat reports the ground stiffened
& Bensen puddles skimmed with ice but it did not
freeze at the cabin. Ther. 34 degrees - 59 degrees
A late freeze.
  A mixed flock of upwards of fifty Warblers spent
the day at the east end of Ball's Hill drifting back & forth
through the oak scrub. Most of them were Yellow rumps
& of these the majority were females. There were also
a Parula Warbler, several Creepers (Mniotilta), a Black-throated
Green Warbler, a Pine Warbler, three adult female Redstarts, three
Yellow Palm Warblers, and one or two Chestnut-sided Warblers.
A swarm of swifts (fully 100) were also darting back
& forth over the hill just above the tops of the trees
from morning to night. There were only a few Swallows
here to-day.
Yellow rumps
abundant.
Parula &
Nashville
Warblers
arrive.
  We found a second & much smaller flock of
Warblers at Davis's Hill among them several Yellow-
rumps, one Nashville Warbler & a Ruby-crowned Kinglet.
  Just after breakfast I heard Red Crossbills calling
on the hillside above the cabin & presently saw
two birds start from a briar & fly off.
 Red Crossbills 
  Red-bellied Nuthatches are staying late. I heard
one behind the birch this morning.
  Spent most of the forenoon writing but walked to
Davis's Hill just after breakfast. In the afternoon
cut out a wood path behind the hill. Small black gnats
very numerous & troublesome for first time this year.
Black gnats
appear
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