Concord
Nocturnal Migration
Ther [Thermometer] Saturday, Sept. 5, 1914 [September 5, 1914] Wea [Weather]
Yellow-bellied Flycatcher Perfect.
Brilliantly clear with light W. [west] wind.
Cool at morn & eve, rather warm thro day.
  Spent forenoon working with three
men on new roads through cedars 
at foot of lane. Warblers in
fair numbers scattered about through 
neighboring birch couverts. Identified
a Yellow-rump [Yellow-rumped Warbler], [male] ad. [adult] (in mid moult
& still wearing much of the nuptial pl. [nuptial plumage])
& [female] juv. [juvenilie] Blackburnian [Blackburnian Warbler], 5 D. virens [Denroica virens], &
a Redstart in [female] pl. [plumage] Watched a
Yellow-bellied Flycatcher for many
minutes, It perched in tree tops 40-50
feet above ground, sometimes amid foliage
of oaks or birches, sometimes on dead
branches in full sunlight. It was a 
very high colored bird very greenish above
& yellow beneath. I cannot recall ever
seeing one behave thus before. I saw
it about 11 A.M. in trees near foot of lane
Henry spent forenoon in Bensen's pastures.
  We motored to Walden Woods
at 4 P.M. Walked in first to Fairyland
Pond. Heard Water Thrush there.
Next visited Goose Pond. I has become
wholly grass green since I saw it last.
A Bittern started from flooded grass
at least 5 Towhees calling in scrub
near it. Heavy migration Warblers
& Thrushes to-night at 9 o'clock.

Concord. (Farm & Ball's Hill)
Ther [Thermometer] Sunday, Sept. 6, 1914 [September 6, 1914] Wea [Weather] Fine
Sunny but hazy & somewhat cloudy.
Cool with light southerly wind.
  To Bensen's pasture with Henry at
9 A.M. He stopped there for golf
practise while I continued on to 
Ball's Hill. We returned to Farm together
at noon. Encountered a big mixed
flock in the Run. Could not spare
time to follow it far or identify
many of its members. These were mostly
Warblers, probably at least 30 in number.
 A Magnolia W. [Magnolia Warbler] an adult [male] Yellow-rump [Yellow-rumped Warbler]
a Black-poll [Blackpoll Warbler] & a Redstart were all I
certainly recognized. A lesser Warbler
flock at Ball's Hill contained not all
than 5 Redstarts all in [female] plumage.
Charlie Carter with wife & daughter
Marjorie came down to dine
with us. We walked to Birch field in 
P.M. Found a horde of little birds mobbing
something we failed to see. At least 5
White bellied Nuthatches in the flock.
The Carters departed at 5 P.M. After that
Henry [Henry W. Henshaw] & I strolled about the farm.