The Wilson Bulletin— No. 47 47 



obliged to move homeward. Rather hasty work in the two 

 swamps which had not yet been touched, a brief visit to the 

 lake shore, and a hurried search through a half mile of woods, 

 closed the day at 5:30. Dawson had recorded Cooper Hawk 

 on the way home, making the combined list reach 1 14. The 

 morning opened with a light frost in low places, but clear 

 until late in the afternoon. The temperature reached 60 de- 

 grees during the day, with a brisk westerly wind dropping 

 completely down before night. The foliage seriously inter- 

 fered with rapid identification, but was little more troublesome 

 than on the 14th, Up to the nth neither blossoms nor leaves 

 were far enough advanced to give trouble. 



The work of the i6th closed a series of record breaking 

 all day studies. While it was serious work, sapping the vital- 

 ity, it yet gave full value in return in showing the exceptional 

 character of the season of migratiou. Three times within ten 

 days the previous best record was broken, and the fourth day 

 equalled. A new high-water mark was made, which nothing 

 but another exceptional season can hope to equal, while a new 

 record for co-operative work has been established as the be- 

 ginning of a long series of such studies, we may well hope. 

 A series of such co-operative studies in any given region can 

 hardly fail to throw light upon some of the vexing questions 

 of local migration, and furnish material for the broader study 

 when made in connection with similar studies in contiguous 

 regions. 



