Experiments with Poultry 



123 



The Hamburg 

 rose comb is domi- 

 nant over the single 

 comb of the Leg- 

 horn and Cochin, 

 the dominance be- 

 ing complete. 



The Hamburg 

 rose comb is domi- 

 nant over the Hou- 

 dan leaf comb, al- 

 though the latter, 

 as stated above, is 

 itself dominant in 

 other combinations. 

 In the second gen- 

 eration (F z ) the 

 Mendelian expecta- 

 tion is largely rela- 

 ized. 



The white plum- 

 age of the Leg- 

 horn dominates 

 over the black of 

 the Houdan and 

 Hamburg, and also 

 over the buff of the 

 Cochin. In only a 

 few cases, however, 

 is this dominance 

 of white complete. 

 In the majority of 

 -cases it is incom- 

 plete, the white feathers being ticked with black, or there are 

 patches of buff or brown. A few exceptional cases were noted 

 where white did not appear to dominate. 



FIG. 10, A. Buff Cochins. {Reliable Poultry 

 Journal.') 



