Cambridge.
Ther [Thermometer] Thursday, May 30, 1918 Wea [Weather] 
Dull
Cloudy with chill easterly wind.
Heavy rain overnight & light [rain] early
this morning.
    Garden birds. 12+ ad. [adult] Robins 4 or 5
singing at once; also young of two sizes,
bob-tailed & fully grown; Swainson's Thrush
[male in full song] singing freely and indeed almost ceaselessly
all day long; 2 Redstarts in [female] pl. [plumage] but
one a [male] singing well; Baltimore Oriole
Red-eyed Vireo, Black-poll Warbler & Chippy [Chipping Sparrow] singing fitfully. Silent Yellow
bellied Flycatcher, Blue Jays (one on nest)
Grackle & Swift on wing. 2 Crows in elm
2 or 3 House Sparrows.
  Spent most of day in Museum writing
letters. Called on the Spelmans in their
garden 5 P.M. Swainson's Thrush singing
& silent. Yellow-bellied Flycatcher there.
Harry S. [Harry Spelman] walked back with me to hear
a grand chorus of Robin voices, almost
deafening at times. Nothing like it for
many years. Robins superabundant elsewhere
in Cambridge, tis said.
  Walter Deane spent evening with
me in den.

Cambridge - Concord.
Ther [Thermometer] Friday, May 31, 1918 Wea [Weather] 
Dull
Forenoon rainy; afternoon clearing
with sun shining dimly & fresh westerly 
wind.
  Garden birds. Countless Robins, many
singing. Swainson's Thrush, Rose breasted
Grosbeak, Redstart, Black-poll Warbler
& Red-eyed Vireo in full song. Only
2 or 3 House Sparrows. Their unusual
scarcity accounts, I believe, for the
exceptional abundance of native birds
but even that will not satisfactorily explain
the unprecedented flood of Robins.
  Leaving home at 10 A.M. Gilbert [Robert A. Gilbert] & I
motored back to Concord stopping at
village for food supplies. Reached
Farm by noon. In P.M. strolled
through Pulpit Rock woods & Birch Field
looking for Gypsy larvae. Hardly any to
be found except on crest of ridge in
Pulpit rock woods where the large
white oaks are somewhat infested.
Elsewhere the foliage looks better than
for many a year especially everywhere
close about Farm.
  Out again after supper transplanting things.