First Gypsy larvae hatching
Concord
Ther [Thermometer] Sunday, May 20, 1917 Wea [Weather]
80 [degrees] Moderate flight incoming migrants. Perfect.
Summer-like day, cloudless with strong, oppressively
warm S.W. [southwest] wind.
  Everything bursting into leaf or bloom. Entire 
aspect of country changing appreciably from hour
to hour. Cherry & peach trees in full bloom
& many forest trees draped in tender green
young foliage, before sunset. Warm air
filled ceaselessly from dawn to dark with
bird music & the trilling of Toad voices from
every pool of shallow water. Peach orchard
wondrous to behold in late P.M. with
low, westering sun streaming through the 
bowers of rose pink blossoms. Altogether a
rare day of days, good to live through on earth.
  First Bay-breast Warbler [Bay-breasted Warbler] ([male full song]), Tanager
(silent [male] in plum orchard), Crested Flycatcher
(calling near Pulpit Rock. Dexter [Smith Owen Dexter] reports
Tennessee W. [Tennessee Warbler] [male in full song], near his house, Concord.
Not much change in other species, already noted
before this. I am surprized nor more birds
came last night. These here scattered widely
but to be seen or heard everywhere.
  Walked to Birch F. [Birch Field] with Tim at 9 A.M.,
through Berry Pasture & Cedar Park just before
sunset.
  A.T. Pierce came up in forenoon to
plan for spraying. Gypsy larvae hatching
everywhere to-day.

Concord
Ther [Thermometer] Monday, May 21, 1917 Wea [Weather]
More Warblers arrive. Perfect
Brilliantly clear with light, cool but not chilly,
N.W. [northwest] wind. Vegetation advancing steadily if not
rapidly. Some apple blossoms about to burst.
  First Cape May Warblers ([male] [female]), Canada W. [Canada Warbler] [male]),
Redstarts ([male] [female]).
  Found one interesting mixed flock of migrant
Warblers assembled at 8.30 A.M. near Pulpit Rock
where, sheltered from the cool northerly wind, they
were flitting low in trees & bushes about the
edges of a sunny opening bordering on a pool
of water. They were very tame & permitted me
to watch them long at close ranges, behaving, indeed,
as Warblers used to in the days of my youth but
seldom do now it seems. The flock included
2 or 3 [male] Bay-breasts [Bay-breasted Warbler], a Canada W. [Canada Warbler], a [male] Redstart,
several Blackburnians [Blackburnian Warbler] & an uncertain number of
Chestnut sides [Chestnut-sided Warbler], D. virens [Dendroica virens], Nashvilles, a Magnolia [Magnolia Warbler]
Black-thr. Blue [Black-throated Blue Warbler] etc. There must have been
30 or more in all. Others scattered about in
white pine woods on higher ground. Here I
came upon a pair of Cape Mays [Cape May Warbler] the [male] a
perfect beauty with almost coal black crown. They
were in a small pine by the path where I
watched them many minutes. They kept up a
low chittering but the [male] did not sing.
10 or more Chestnut sides [Chestnut-sided Warbler] & Marylands [Maryland Yellow-throat] on south
side of run. A Maryland flew against pl. glass window
early this morn. 3 Hummers in blossoming peach
trees in late P.M.
  Dexter came to dinner. After it we went to
Pulpit R. [Pulpit Rock] & Birch Field. Saw a good many
Warblers but nothing new.