Concord, Mass.
1905
May 10
  Clear and cool with high W. wind.
  I was absent from Concord to-day but Mr. Forbush
watched the birds closely. He reports a large flock of migrants
on Ball's Hill. Most of them were Yellow-rumped Warblers
but he also saw a pair of Black Throated Blue Warblers
and a male Wilson's Black-cap.