346 
The Journal of Heredity 
A WHITE PLYMOUTH ROCK (155M) 
During the breeding season of 1919, the blue Andalusian Hen (C2032), after she had become pure 
white, was mated to this White Plymouth Rock (155M). Out of twenty-five chicks hatched, seven 
were blue and eighteen were black. Two of the offspring are shown on the opposite page. 
graph by James Machir. (Fig. 5.) 
During the [breeding season of 1920 
she was mated with white Wyandotte 
9206IM. This bird was similar in geno- 
typeto 118M and 155M except that he 
was heterozygous for J? (inhibitor of 
pigment), a factor for dominant white. 
Nine chicks were hatched of which 
three were blue, four were black and 
Photo- 
two were white. The theoretical ex- 
pectation would be 2.25 blue, 2.25 black 
and 4.50 white. 
It is evident that C2032, though 
snowy white, was continuing to}breed 
as a blue Andalusian. A genetically 
recessive white female mated to the 
white Plymouth Rock used would have 
