THE ROLLER CANARY 59 
they are safe to use. A short, indistinct phrase of this 
character will do no damage; on the other hand, lengthy 
Bell and Hollow Bell of this description are very harm- 
ful. If one is compelled to use these half-hoarse tours 
they must be short ones; they will always be imitated 
and worse. Really hoarse birds should be doctored up 
in the kitchen, or where they can get warmth and 
moisture, which are the best means for curing them. 
Birds in full breeding condition should not be used 
as tutors, and the old birds should be taken away during 
their moult, as they may teach the youngsters many a bad 
lesson which they otherwise would not have got into 
their song. 
