THE MEANING OF MUSIC AMONG BIRDS. 83 
ete., are well provided with distinct scolding notes 
and distress cries, and many, like some boys, fight 
crying all the time. 
Some have a distinct tone for all the cries, but 
the “attempt to please ”—the true song or serenade— 
can usually be distinguished by the manner of its 
delivery. 
There is much else about the accompaniments of 
song, the mechanics of song, where rattles, quill snaps, 
air swoops, ventriloquial effects, and various other fea- 
tures of charming, challenging, and calling come in, 
but our limits prevent their discussion. Likewise the 
topics of how songs are acquired, or the instincts of 
song, and what songs tell of a bird’s associations, of 
its mimicry of and influence by others, ete., are in- 
teresting, as well as the relations of song to size, color, 
structure, climate and weather. 
