88 THE ROLLER CANARY 
for variation, its difficulty in cultivation and its position 
as a parent or strain tour, it is fully qualified to rank 
with Hollow Roll in value. 
WATER ROLLS 
Composition. The good ground tones are based on 
the vowels 0, u, tu; if on a they are less valuable. 
The accompanying consonants are w, g, d, d, 1, r, b, and 
so arranged that they form syllables, such as the 
following :—gwudlrudlgwudlrudl;_ —rodlgwodlrudlrod]; 
gwadlradlgwadradl;__bliudlrudlbliudlrudl, — bludlrudl- 
bludlrudl; bliudlriudlriud|bliudl. 
The play of the Water Rolls reminds us of the 
gurgling, rushing, bubbling of a tiny brook, whirling 
and eddying over its pebbly shallows. We may imitate 
the sound somewhat by dipping little tubes of various 
sizes in water and blowing through them. The larger 
the tube the deeper the tone; the deeper it is dipped into 
the water the more hollow, subdued and soft is the 
resultant tone. Now, if the tube be slowly withdrawn, 
one can plainly detect a weakening of the ground tone 
and a stronger outflow of air bubbles until, when the 
surface is reached, the bubbling becomes a weak, broad, 
splashing ripple which has no value for producing 
effect. ' 
In the Canary song we make a distinction between 
a simple Water Roll, which splashes a little more or less, 
and its deeper sister tours, Hollow Water Roll or Kuller- 
ing Water Roll, which are more beautiful and valuable. 
Both these are sung with the beak quite closed, the bl 
and dl sounds are softly intoned, and, together with the 
Schockel or swing-like movement, this gives a very 
