THE ROLLER CANARY gI 
constitute a singularly beautiful diversity in Canary song, 
which is bound to bring delight to every one with good 
taste and judgment. We know that many years ago, 
some birds had, besides the above style of Koller, a very 
deep Hollow Roll, a brilliant Knorre, and no nasty faults, 
not even Aufzug; they sang so fluently, fervently, and 
with such modulation that it was astonishing. It has 
therefore been established that Koller birds can be bred 
pure both as to tours and quality of tone, so that those 
breeders who are afraid of cultivating Koller on account 
of its presumed liability to produce faults are in the 
wrong. 
On account of its wonderful effect, its many-sidedness, 
its difficulty to breed, and its importance as being a deep, 
fundamental tour, Koller is highly esteemed. In past 
times it was called the “‘ Queen of. all the Tours.”’ 
During the period devoted to breeding the easier Hollow 
Roll it seldom appeared, but of late endeavours have 
happily been made to resuscitate this deep tour and to 
widen its popularity, and thereby to further enrich the 
bird’s noble song. Whether we succeed in winning 
back the early style of Koller time alone will show. 
Koller is at present valued for points the same as Hollow 
Roll and Bass Roll. 
GLUCK ROLLS 
The good ground tours in Gluck Rolls are u, 0, u; 
the less valued are e, a, 4. The consonants are g, k, 
tr, 1, The syllables formed are glruk-glruk-glruk, glrok- 
glrok-glrok, glriik-glriik-glriik. 
Gluck and Roll being here combined, the result is a 
discontinuous Roll tour. Each syllable possesses an “ r,”’ 
which gives it the roll form; each syllable, however, is 
