1902.
June 18
Concord, Mass.
  Brilliantly clear with strong, cool N.W. wind.
  Came to Concord this afternoon by the 5.01 train
from Arlington to West Bedford.
  Walking to Barrett Meadow after supper I heard a
Night Heron quawking over the Great Meadows and two
or three Marsh Wrens singing in the best of Phaleris
grass at Beaver Dam Rapids. Two Red-wings and a 
Song Sparrow were also singing. A Bittern was pumping
opposite the cabin on the 15th and 16th but I heard none
this evening although the weather was calmer & beautiful.
Two Robins and a Tanager were singing at the western
end of Ball's Hill and a Grass Finch in Pine Park.
As twilight was falling I heard a Whippoorwill in the
direction of Benson's house, probably in Prescott's pines.
Birds in song
  The Bull Frogs and Green Frogs have been at the
height of their vocal sounds for a week past. The former
were out in great force this evening making the marshes
resound with their sonorous voices.
  When I left here on the morning of the 16th the
Vireo's eggs in the nest near the cabin were still unhatched.
Hansen saw all four of them late yesterday afternoon
but when he looked into the nest at 9.15 this morning
there were three young birds and one egg as was the
case when I examined the nest at 6 P.M. The female was
absent on the latter occasion but at 7.30 P.M. I found
her on the nest. I thought at first that she was dead
for her head was bent down under her breast & quite
invisible while the feathers of her back & hind neck
were crumpled & standing erect. Indeed all that I could
Red-eyed Vireo's nest
30