1893
April 24
(No 4)
Concord, Mass.
(Ball's Hill)
  I spent the day overseeing and working with the
men near Davis's Hill. A Solitary Vireo (the first) was
singing at intervals in the pines near the glacial hollow.
[margin]Solitary
Vireo[/margin]
  Another arrival was a White throated Sparrow, a
solitary bird which I started among alders in a 
swamp and which, to my surprise, was an
immature ie grey-throated bird. This is the first
instance that has come under my observation when
a bird in this plumage has appeared at an early date. 
[margin]White
throated
Sparrow[/margin]
  The Doves have certainly deserted my woods, doubtless
because of the presence of the Cooper's Hawks which 
have probably killed some of them & frightened away
the others. I heard one cooing in the afternoon
in pines on Prescott's land and saw another flying
high across the river at sunset.
[margin]Carolina
Doves[/margin]
  The large flock (there proved to be fifteen or twenty
birds) of Yellow Palm Warblers noted this morning
spent the entire day in the pines behind Ball's Hill.
The Ruby crowned Knights with them sang at
frequent intervals throughout the morning.
[margin]Yellow
Palm
Warblers[/margin]
  The Osprey also stayed during the day making
his headquarters in the big pines on Davis's Hill
and whistling a good deal.
[margin]Osprey[/margin]