Concord, Mass.
(Ball's Hill)
1900
May 11
  Clear with strong W to SW winds. Early morning
bitterly cold. Pat brought ice 1/4 inch thick from the
meadow across the river. The ground was frozen hard at the
cabin. The extremes of temperatures registered by my thermometer
were 28 degrees - 58 degrees. Strange to say that vegetation does not
seem to have suffered in the least although the cabin
ferns are a foot high & many of the trees & shrubs
covered with small leaves.
Still another
cold snap,
remarkably
severe for the
season.
  Despite the extreme cold many birds apparently
departed and a few arrived during the past night. 
At least we had a distinctly new lot at Ball's Hill
to-day. Thus there were a Magnolia & Black-throated
Blue Warbler, a Lincoln's Finch and a Hummingbird
while there was a marked increase in the number of
Water Thrushes & White-throated Sparrows. The Bicknell's
and the Olive-backed Thrush as well as the two
Black-poll Warblers which were here yesterday had
disappeared. The Yellow rumps, Yellow Red-polls,
Chestnut-sides, Maryland Yellow-throats, Redstarts &
Swamp Swallows were still present in remarkable 
abundance although their numbers had apparently
somewhat diminished. I saw a female Marsh Hawk
at Ball's Hill & a Carolina Dove flying over Bensen's
field towards the Hill. Gilbert found a Partridge's
nest with 9 eggs at the foot of the oak covered ridge
on the W. side of Ball's Hill Swamp. He saw
the bird on the nest which was at the foot of
a leafless maple.
Movements of
migrating
birds.
Marsh Hawk.
Carolina Dove.
Partridge's
nest, 9 eggs
  Visiting the farm in the forenoon I saw a Black-
billed Cuckoo by the roadside. In the woods near
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