THE TREE SWALLOW 



culation but almost beyond imagination." ^ He pleads 

 for the protection of all swallows and suggests that the 

 "white-bellied swallows" be supplied with boxes similar 

 to those constructed for bluebirds, only placed at a greater 

 elevation and protected from cats. 



Tree swallows are the first to come and first to go. Be- 

 fore the summer has really arrived, as early as July first, 

 they begin to flock and form great colonies that may be 

 seen migrating during the daytime. 



1 Farmers' Bulletin 630, U. S. Biological Survey, U. S. Dept. of Agri- 

 culture. 



[171] 



