Concord, Cambridge. July 18, 1904.
  A third intensely hot day relieved by a breath
of E. [east] wind in P.M.
  Spent forenoon at farm. Went to Birch Field
with Pat & gathered from old walls & stone heaps a
large number of mossy or weather-stained stones which
Hansen will take to Cambridge to-morrow & which
I  shall put around the little pond on front of the 
museum.
  Returned to Cambridge via Ball's Hill & West Bedford
by the 4.24 P.M. train.