1906.
April 14
  Cloudy with violent S.W. wind. A gloomy day, not
really cold but disagreeably chilly.
  A Robin, a Song Sparrow, a Tree Sparrow, a Phoebee
and a Flicker were singing near the house in the early
morning but later in the day I saw and heard almost
no birds of any kind. J. C. Melvin who made me a short
visit heard a Dove cooing in Birch Field. Hylas and
Wood Frogs were in full cry in every direction at evening.
Yesterday the Wood Frogs croaked unceasingly, by scores if
not hundreds, all day long and as late into the night
as I was awake. I heard them first on April 7th in
the meadow below the orchard where they have been croaking
ever since. Two days later they began in the brook 
meadow across the road and on the 12th I heard them
in the Barrett Run. Thus they begin in different pools on
different dates.
  At sunset last evening twelve Fox Sparrows were feeding
on the bank in front of the house. A little later they
flew up into the big elm and thence, one after another,
at rather wide intervals, to the bushy swamp on the
borders of the brook that traverses our blueberry pasture. I
wondered at the time whether they would pass the night
in this cover or push on northward. They must have adopted
the latter course for not one was seen or heard about
the farm to-day. I would give much to know just
when they started on their nocturnal journey. They
flew into the swamp as twilight was falling and in
a manner which indicated that they were going to roost
there. I am quite sure they did not begin their migration then.