TWENTY-SIX COMMON BIRDS. 
2 7 
in an apple tree or bird-box, but often in fence posts or other hol¬ 
low situation. It is composed of grass and feathers, and the eggs, 
four to six in number, are light blue. The males stop singing soon 
after the nest is constructed, but begin again in July, when the 
second brood is contemplated. In the fall the birds flock together, 
and their warble, in which the ear catches, perhaps from associa¬ 
tion, a tinge of sadness, is a characteristic sound of autumn. At 
this season and in winter, berries constitute a part of the Bluebird’s 
food, but in summer it destroys countless beetles, cutworms and 
other insects. 
