Concord, Mass.
1910.
Sept. 23
[September 23, 1910]

  A brilliantly clear and delightfully warm day following
a sharp, frosty morning.

Black poll Warbler in nearly full song

  About 7 A.M. a Black-poll Warbler sang thrice in
the oaks near the cabin. It must have been an adult
bird for its song was nearly as strong and quite as prolonged 
as that which we ordinarily hear in spring.

A Jay roost?

  Just before sunset this evening I heard Blue Jays
making a lot of noise in a woods of young red maples
on the edge of the swamp behind the hill. On going to
the place I found a dozen or more of them flitting about
in the tops of these trees apparently seeking roosts for
the night. I watched them for sometime & finally left
them there. They made all sorts of low conversational
chattering & chuckling sounds but did very little screaming
This is the only occasion I remember when I have
seen Blue Jays there congregating to roost.