Concord, Mass.
Ball's Hill.
1900
July 12
  Clear and very warm with violent S.W. wind
which brought a heavy thunder shower at evening.
  Took the 8.34 A.M. train to Concord. Spent most
of the day overseeing some work at the cabin. The strong 
wind lashed the trees about like reeds & effectively
silenced the birds. Indeed during the day I heard
nothing singing but a Pine Warbler, A Mary and Yellow-throat,
two Red-wings and a Red-eyed Vireo. At sunset, just
after the shower had passed and while the heavens were
suffused with an exquisite rose-amber light, a Robin,
a Song Sparrow and two Swamp Sparrows sang, a Veery
called, a flock of fully 100 Swallows (mostly Barns)
appeared high in air whirling about in a cluster
like a swarm of bees, and two Night Herons, quawking
hoarsely came over Ball's Hill from the north and
sailed down on set wings towards the middle of
Great Meadow. Earlier in the day I saw two Bitterns
flying about & occasionally alighting in the meadow
opposite the cabin. Pat says they have been there
constantly of late. The attraction is probably a multitude
of young Leopard or Pickerel Frogs which we noticed all
along the canal we crossed this forenoon.
Birds singing
through day.
Birds singing
at Sunset
Flight of
Swallows
at evening
Night Heron
Bitterns
  A pair of Red-eyed Vireos accompanied by several
young were flitting about near the cabin in the
afternoon. The young left uttering a wiry Tzee, Tzee,
evidently a call for food.
Call notes of
young
Red-eyed
Vireos
46.