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 F-^ hen was 

 used (see p. 193). 



Brown Leghorn Silky 



Br.L, 



? 



r" 



? 



gTbp.l. 



T 



T 



^^f f?®"^? ©O(ifc?0 O 



Fig. I. 



Silky Brown Legliorn 



Br.L 



jx 





cTBr.L 



1 r 



1 r 



Gfo'f© ^•To'cTf® OGfcT©^ 



Fig. 2. 

 In these figures 



(J Q represent unpigmented birds. 





? 



deeply pigmented birds. 



birds with so)ne gi'ade of pigmentation other than the 

 deeply pigmented type. 



The Fi birds were also crossed with the pure Brown Leghorn and 

 the results were strikingly different according as the sex of the F^ 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 



