Constitution of the White Leghorn Breed. 



177 



Table 13. — Showing the results of the crosses indicated above. 



♦Provided the zygotic constitution of the 9 325 E is CCbbFfli. 



From the data presented in Table 13 it is apparent that in the 

 mating of 325 B with his black sister, 325 A, there was a tendency 

 to produce equal numbers of black and barred progeny ; and that the 

 sex-ratio between these groups approximated 1:1. 



In the mating of 325 B with his white sister, 325 E, half the 

 progeny were white, while the other half included both black and 

 barred birds in equal numbers and equally divided between the 

 sexes. 



(White Leghorn cf X Black Minorca 9 ) cf 



Case 3f.— d^ \ ^ X 



[ Black Minorca 9 J 



Black Java 9 . Nature of mating: CCBbffii X CChbFfii. (For 



discussion, see Case 5, p. 203). 



Among the self-colored birds with which the barred cross-bred cf 

 325 B, was mated during the season of 1912 were the Black Java 99 

 335 C and F. The results of this mating are given in Table 14. 



