concord 
^Early yesterday afternoon and again to-day at nearly 
the same hour I heard a Nighthawk peeping in the oaks 
"behind the "barn; It was unquestionably perched on one of 
the branches of those large trees but I looked for it in 
vain. The weather was clear on both occasions. The bird 
peeped six or eight times at short intervals. 
On the morning of the 19th I found two Northern 
Water Thrushes among some bushes that border a stone wall on 
the hillside just below our farm and at noon to-day I started 
one in the flower garden behind the farm-house. It is very 
unusual for them to frequent such elevated, dry places at 
this season, at least in this neighborhood. 
Swainson's Thrushes are unusually numerous here this 
spring. Two in the deep hollow behind Ball's Hill were 
singing and calling much of the forenoon. Two others were 
calling in Birch Field — a favorite haunt of theirs. I noted 
their calls thus: Whip , whip , whip- cr r x r and pip , pip , the 
latter being apparently a variation of the whip note. The 
song is ntell-nigh impossible to render but I noted it 
whe r- e r- c o- e- e—e.,^" 
Saw several Black-throated Green Warblers to-day in 
low bushes and two or three hopping about on the ground in 
company with Haryland Yellow-throats. This happens, I 
believe, only during migration and when the weather is excep¬ 
tionally cool. 
