1906.
Sept 9.
  Brilliantly clear and delightfully warm with light,
dry west wind.
  A bird wave of unusual magnitude rolled down
from the north last night. It is interesting that it
should have come during the warmest night of a
warm stormless week and that the birds should have
all pushed on after but a single day of rest. That
they did this seems to me nearly certain for the 
air was evidently filled with them from shortly 
after dark this evening until about 9.30 P.M. After
that their chirping became less and less frequent
and when I went to bed at 11 P.M. it had
almost wholly ceased. Mr. Forbush who slept in
the open air tells me that he woke at 2 A.M.
next morning & listened for some time without hearing
a single call. The bulk of the flight lasted only
about two hours or from 7.30 to 9.30 P.M.
  During the day the woods and thickets were
 alive with Warblers most of which were Black-polls.
Of these there were about 25 at Ball's Hill and
not less than fifty in Birch field. In the latter 
place H.W. Henshaw & I found among the Black-polls
one Orange Crowned Warbler, a Bay breast, 3 or 4
Black-throated Greens, & a Redstart. At Ball's Hill
I noted a Nashville Warbler, a Connecticut Warbler
& a seasonal Redstart.
  The Bay-breast seen in Birch Field was
an adult male in autumn plumage. It showed traces
of the black head markings and a broad conspicuous 
strip of chestnut along each side.