Concord, Mass.
1893. 
July 20                                
  Clear, calm, hot in the sun. A fine midsummer day.
  Despite the hot sun there was a quality in the air
like September and the morning & evening were decidedly
fresh & cool. The air, also, was very dry & almost perfectly
free from haze. The conditions seemed to please &
excite the birds for such species as have not become wholly
silent sang freely during most of the day. Early this
morning & again at evening the singing seemed almost as
vigorous and general as in early June but analysis
showed that it proceeded almost wholly from the Robins, 
Sparrows[,] Vireos and Blackbirds. The Warblers being represented
only by two D. aestiva, who warbled listlessly a few times,
and by Pine Warblers which were singing freely at
sunset. The Bobolinks, Orioles. Least Flycatchers, Phoebees,
Bluebirds & Wilson's Thrushes were wholly silent & I heard 
only one Cat bird along a stretch of four miles of river.
The Brown Thrasher has been silent ever since the month
came in and I have heard the Nashville Warbler but
once. Robins, Wood Thrushes, Song & Swamp Saprrows, Towees,
Grass Finches, Yellow winged Sparrows, Indigo Birds, Meadow Larks, Redwings.
and Quail are the most prominent & persistent songsters
now. The Red-eyed Vireos are equally vociferous but the
Warbling & Yellow-throated Virios sing only a little at morning
& evening. Chippies & Field Sparrows are still singing
but not at all freely. The Red-wings have fallen off very
decidedly during the past week but to-day I heard
nearly as many as in June.
     Of Batrachians the Bull & Green Frogs are the only species
still in song & neither shows as yet any signs of abating.
The Tree Toads ceased a week or more ago.