THE ROLLER CANARY 75 
called “ straight,” riiriiriirti, and so on. If it descends 
in tone, the syllable changes as it falls, rurtiru—-rororo, 
and so on; this is called falling Hollow Roll. If it 
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ascends in tone, it is called rising Hollow Roll rororo— 
rururu. 
If the bird in one breath sings in varying pitch, 
~~ Straight Hallow [oll 
Tu 
TT ire), Fa ling Sto/low toll 
~ : 
eee Frising Llollow Froll 
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Bent Stollow (oll 
alternately rising and falling, the tour is called bent 
Hollow Roll, rorororurururoro, and so on. The 
above drawing will make this clear. 
