366  Our  Canaries 
will  remain  about  the  same.  A  Yorkshire-Roller  cross  on  the  other  hand  gives  a 
considerably  improved  appearance  in  size,  shape  and  colour,  but  the  song,  though 
still  good  after  proper  tuition,  will  be  of  a  decidedly  lower  order.  A  Norwich 
cross  yields  plump  cobby  birds  of  a  greatly  increased  depth  and  richness  of  colour, 
but  with  a  louder  and  harsher  song  than  either  of  the  two  first-named  crosses. 
A  type  of  English -bred  Roller  Canary. 
In  introducing  either  cross  a  selected  Roller  cock  and  hen  of  the  same  strain 
should  be  chosen  as  carefully  as  if  they  were  for  breeding  pure  Rollers,  and  mated 
with  a  hen  and  cock  respectively  of  the  breed  chosen  to  cross  with.  The  Roller 
hen  should  be  left  to  hatch  and  rear  her  young  alone  in  order  to  prevent  as  far  as 
possible  the.  young  hearing  any  song  but  the  Roller's.  The  following  year  one  of 
the  cross-bred  cocks  from  the  Roller  cock  should  be  mated  with  the  Roller  hen 
and  a  young  hen  from  the  Roller  hen  mated  back  to  the  Roller  cock,  and  the  re- 
mainder of  the  young  from  each  pair  mated  together.  Each  year  the  young  cross- 
breds  should  be  trained  under  pure  Rollers  as  systematically  as  pure-bred  birds, 
and  only  the  most  satisfactory  performers  preserved  for  breeding  stock. 
