Concord, Mass.
1900.
August 1
  Clear with cool N.W. wind.
Ball's Hill
  I came from Jaffrey this morning to spend a few
days at Ball's Hill. Before going there I drove to
Auger's Mill where I heard a Yellow Warbler in full
song and saw one or two others flitting about in the
trees over the brook.
Yellow warbler
in full song.
  At Hildreth's Corner thirty or more Martins were circling
about their house. Capt. Dakin tells me that they have
reared a large number of young this season, so many, indeed,
"that not all can get inside at night." He thinks that
the total number of young & old at present frequenting the
two boxes on his place & the box across the street
"must be fully 300" but this is probably an exaggeration. 
Purple Martins
  As I passed the Merwins' a Warbling Vireo was
singing in the elms in front of the house.
  At Ball's Hill I heard in full song a Solitary Vireo,
a Long-billed and a Short-billed Marsh Wren, a
Song sparrow and two or three Swamp Sparrows.
Birds singing 
near Ball's Hill
  Late in the afternoon a Rose-breasted Grosbeak,
apparently an adult, sang ten or a dozen times at short
intervals. Its voice was about as loud & rich as in 
the breeding season but the song was much shorter &
less varied. Near where I heard it I afterwards saw
two young Grosbeaks.
Grosbeak in 
nearly full
song.
  A good many Swallows & Swifts were coursing about
at evening and the chink, chink of Bobolinks came
from the meadows opposite the cabin.
Birds noted
at evening
  Red-wings were also flying about in small flocks but
I heard none singing. The Quail also seem to have
become silent since my last visit.
51