1906.
May 26
  Clear and warm with strong S.W. wind. Ther. 50 degrees -79 degrees.
  The only northern migrant noted to-day was a
Black-poll Warbler singing near the house this morning.
Migration
  Hylas and Tree Toads have been in full cry last
evening and this in the pond across the road. Mingling
with their voices I have heard both evenings a yelping
ow-ow-ow-ow-ow-ow not unlike that of a hound. This
cry is new to me. It is less loud than a dog's but
yet by no means a faint or ill-defined sound. It
is repeated at long and irregular intervals only. The notes
are given rapidly and their yelping quality is pronounced. 
I am very sure that they come from the pond
but I cannot even guess what their author can be.
I have thus far heard them only after dark. They
are wholly unlike the strange Rail-like voice that
I heard in this meadow last year and that I
think could be the call of the creature that Abbott Thayer
has heard at Dublin and has dubbed "the ghost."
Another mysterious voice