90 THE ROLLER CANARY 
of a two-voiced and three-voiced nature, having 
somewhat of the effect of a trichord. 
One description of the rise and fall of what gives 
an effect of a three-toned or trichord Koller is given 
thus:—The ‘ri’? moves on with a roll an octave 
higher than the deep Koller breast notes, and, like these, 
it changes its pitch at the same time; in other words, the 
“‘ri”’ rises and falls, while at the same time, in the 
deeper key, a tremolo lillillii, combined with lallalla, 
rises to lillilli, combined with lillillu, to fall deep on to 
lullo, lollo, blobllobllo, or kollokollo. 
In Koller, one hears nothing of Knorre, nothing of 
Hollow Roll, and nothing of Gluck, but a pure Hollow 
in quick, rhythmic movement. The bird, in fact, sings 
the word Koller. As we say Knorre when the bird 
sings Bass, so we call the tour Koller when a bird sings 
the text—kollerkollerkoller, etc. 
WONDERFUL MUSICAL EFFECTS 
Here let us remark that there are variations; 
sometimes the “k” is left out, and so we have 
ollerolleroller, another bird will slur over the “r,’’ and 
one hears kollokollokollo; sometimes the “‘k”’ is soft 
or is replaced by ““b”’; sometimes in place of the “‘o” 
we get “ui” (kuller), or e, i, a. According as a con- 
sonant is left out or another is introduced, the effect 
differs. We get thus certain variations, which are, 
however, fundamentally Koller-forms. In those of 
medium depth one may plainly detect the treble effect, 
whereas in those of deeper pitch one may hear the double 
effect. 
The wonderful musical effects which Koller produces 
