Concord, Mass.
1910
April 18
(No 3)
[April 18, 1910]

Bitterns

near at hand I failed to see her. Whenever one
of them "pumped" the other was sure to respond
within two or three seconds, sometimes facing his
rival, sometimes turning in another direction. 
During most of the time when they were in
this marsh together both birds showed the white
which we saw yesterday but when one of them 
finally flew away the other ceased altogether
to display it although we had him in view 
for a considerable length of time (fully 20 minutes)
during which he pumped repeatedly. I will now
proceed to describe it more fully than I was
able to do yesterday. It was seen much better
and for a longer period to-day with the added
advantage that on this second occasion I was
able to check as well as supplement my own