22 
Canary Breeding 
From these results it follows that : 
(1) Reciprocal matings of crest and crest-bred plainhead (C x c) result in 
practically an equal number of crested and crest-bred plainhead young*. 
(2) Double cresting {G x C) gives twice the number of crests as compared 
with crest-bred plainheads. 
(3) Double crest-bred plainhead breeding (c x c) is so well-known never to 
produce a single crest that I have not included any matings of that sort in 
my paper. In this mating crestlessness is recessive (fig. 2). 
Fig. 2. Variegated crest-bred Norwich Plainhead. Fig. 3. Heavily variegated Norwich Crest. 
First Prize, St Helens, December, 1908. First Prize, St Helens, December, 1908. 
From an original sketch by E. F. Bailey. By permission of Canary and Cage Bird Life. 
(4) No crested bird (fig. 3) in my reciprocal matings of crest and crest-bred 
plainhead has produced crests only, or in sufficient number to be worthy of note : 
those producing most are : 
2. '91 a d.y. ^ = C 7, c 1. 
5. '98 a VI. y. % (c. gr. b. x C. t. y. Lan. {3. '97}) = G 6, c 1. 
2. '99 G. gr. ^ (G. m. x c. v. 1. '98) = C 6, c 1. 
(5) Those birds used in double-crest (6^ x G) matings which produced most 
crested young were : 
5. '97 G. m. (G. m. x c. v.) = 0 5, c 1. 
5. '98 G.t. = G 4. 
1. '06 G. cl. (c. m. X G. d. Lan. 5. '03) = G 2, c 3. 
5. '07 „ =0 3. 
3. '08 „ =(7 3. 
* Skulls from this mating were preserved and none showed the condition of hernia cerebri. 
