Heavy 
night flight 
ax biers 
for a full minute without hearing one or more and often 
several would call in quick succession. Evidently the sky 
was thronged with them. No doubt they were the birds which 
came last night and spent the day in the region about and 
to the northward of Concord. The flight seemed to slacken 
at about 8.30 P. M. The night was clear, still and warm. 
