W. Bateson and R. C. Punnett 



187 



chicks of various grades of pigmentation ranging from the deepest 

 pigment to none at all. The F^ generation however presented certain 

 distinctions according as a pigmented, or a non-pigmented ^i hen was 

 used (see p. 193). 



Brown Leghorn Silky 



Br.LO X 



^ 



cTbp.l. 



1 I r 



1 1 



Fig. I. 



Silky Brown Leghorn 

 #" X ^ 



Br. L.C 



(5f 



CfBr.L 



I — I \ — I — f I — I — \ — I — I — I I — r 



Fig. 2. 

 In these figures 

 (J O represent un pigmented birds. 





deeply pigmented birds. 



birds with some grade of pigmentation other than the 

 deeply pigmented type. 



The F^ birds were also crossed with the pure Brown Leghorn and 

 the results were strikingly diflferent according as the sex of the ^i was 

 male or female. When the F^ $ was crossed with the Brown Leghorn (^ 

 none of the offspring were deeply pigmented, and this was true for the 



