Concord, 
1893. 
Sept .9. 
Chae tura rjelagi.ca . 
^ ss> Heavy migration. 
During the descent of the river and while at Ball's Hill 
we had not seen a single Swift hut at evening as we were pad- 
dling past Holden's Hill fiyfe of these birds appeared at a 
great height overhead and began descending and cutting aoout 
after their usual fashion. Others followed them and still 
others until by the end of the next four or five minutes there 
were fully 75 darting bach and forth over the river and woods. 
They all came from the north, as I could plainly see by watch- 
ing the shy in that direction, and evidently were migrating 
birds which merely made a brief halt to secure their evening 
meal. For the remainder of the way up the river Swifts were 
continually in sight either flying low and feeding or heaping 
on directly south at a height of 300, or 400 feet. Al.<. those 
which I saw after sunset were flying high and towards the 
South. There can be no doubt that what we witnessed was a 
veritable migration. 
