ON TREES AND BIRDS. 



157 



bellied swallows will be grateful for boxes like those for 

 the bluebird, but placed in some higher situation. 



BARX SWALLOW. 



The altitude of swallows, in their flight, has always been 

 noticed by observers to indicate the character of the weather. 

 In a dry atmosphere the flies and other insects venture high up; 

 preceding a storm they keep low. Where the flies are there are 

 the swallows. AUTHOR. 



