96 



A MANUAL OF MENDELISM 



male and female Campines, putting C for complete and 

 c for incomplete barring, must be : 



Males 



MM 

 c c 



Females 



M 

 c 



This hypothesis is tested by the experience of English 

 breeders, by whom both varieties of Campine fowl were 

 introduced from Belgium a quarter of a century ago. 

 Preferring completely barred male birds, they retained 

 such of these as were occasionally thrown and bred 

 from them. Mated with ordinary Campine hens, these 

 hybrid males should produce both completely and 

 incompletely barred sons and only completely barred 

 daughters, as follows : 



MM - M 

 Cc ^^"^ c 



should MM MM M 

 produce C c c c C 



This result occurred among the stock belonging to the 

 Rev. E. Lewis Jones. 



On the other hand, males which are pure for the 

 complete barring factor should leave all their progeny 

 completely barred when mated with ordinary Campine 

 hens, as follows : 



MM J M 

 C C ^"'l e 



, , , , MM , M 

 should produce ^ and p 



From this mating Mr. Jones got 6 completely barred 

 cocks and 6 completely barred hens. 



Thus three factors coupled with femaleness in poultry 



