I9I0.] DAVENPORT— NEW VIEWS ABOUT REVERSION. 



295 



generation some individuals, both males and females, show a typical 

 Jungle fowl coloration. In this case the factors in the White Leg- 

 horn are the same as in the Black Spanish with the addition of 

 another — the whitening factor (W), probably an antienzyme that 

 stops the work of the pigmentation factors. Thus the formula of 

 the White Leghorn is CJNW and its hybrids with the Silkie have 

 the formula CcJ^NnWw. The germ cells of the hybrids are of 

 eight kinds, namely, CJNW, CJNw, CJnW, CJnw, cJNW, cJNw, 

 cJnW, cJnw. These give 64 combinations in the fertilized eggs of 

 the second hybrid generation. I raised only 85 chicks. The rela- 

 tion of expected and observed numbers is given in Table IL It 

 will be seen that realization runs close to expectation. 



Table II. 



White. 

 (Including Fj Type of Color.) 



Expected 69 



Observed 68 



Game. 

 12 

 16 



Black. 



4 

 I 



Finally, I may refer to a cross between the Black Cochin and the 

 Buff Cochin. The Black Cochin has the color factor C and it has 

 the supermelanic coat, but it seems to lack the red of the Jungle type 

 of coloration. This modified Jungle type may be called I. The 

 Buff Cochin is like the Black Cochin with the addition of a super- 

 xanthic coat (X) which produces the uniform red color. In the 

 second hybrid generation these factors should appear in the com- 

 binations shown in Table III. 



Table III. 



each combination having the prefixed frequency and yielding the 

 color indicated. Uniting black and black-and-reds, since red ap- 



