Concord.  April 13, 1904.
  Clear with strong cool N.W. [northwest] wind. The
surface of ground slightly frozen this morning.
  Spent day at farm working with the three
men. We planted all the larches & spruces dug
yesterday at the foot of the hill below the
orchard. Also set out nine hemlocks (bought last
year & about 2 ft. [feet] high) on the hillside near the 
boat path. 
  To Birch Island & Prescott's Pines at evening.
The frosty air silenced the birds but a Great Horned
Owl hooted from 5.30 to 6.30 in Lawrence's big pines.
  The Bluebirds have nearly ceased singing.