3O2 R. M. STRONG. 



As only four blond female hybrids and no male white hybrids 

 were obtained in FI, it was not possible to do much breeding of 

 hybrids inter se. Two pairs of blond hybrids were mated and 

 the results of their breeding are given in Table III. The occur- 

 ence of a white bird in 2 is of course to be expected on a Men- 

 delian basis. Again the same preponderance of males appears. 



TABLE III. 



BLOND Fi HYBRID MALES X BLOND Fi HYBRID FEMALES. MATINGS 28 AND 44. 

 Fz 10 blonds: 3 males, i female, and 6 sex ?. 



{ 



i white female. 



B.tf 1 B.9 W. 9 



I I I 



X 



Fi \ B.c? B.9 B.cf B.9 W. 9 



I I I L J_ J 



f I I 



p r i i i 



[B.C? W. 9 W.cT B.9 (Original Stock.) 



TABLE IV. 



BLOND Fi HYBRID MALES X WHITE Fi HYBRID FEMALES. MATINGS 14, 20, 35, 



37, AND 42. 



Fj 6 blonds: i male, 2 females, 3 sex ?. 

 5 whites: 3 females, 2 sex ?. 



j B.<? B.9 W. 9 B. W. 



r 2 



I III 

 f B.<? B.9 B.d 1 B.9 W. 9 B.c? B.9 W. 9 

 Fl 1 I 1 III I \_ I 



X- -r i- -X- 



P JB.c? W. 9 W.cT B^9 W.cf B.9 



(Original Stock.) 



Blond hybrid FI males when mated with white hybrid FI 

 females (see Table IV.) gave results which are similar to those 

 obtained in Table II. where approximately equal numbers of 

 white and blond birds occurred. Again the white birds sexed 

 were all females. 



Professor Whitman obtained similar results which were given 

 to Bateson and are referred to by the latter in a footnote (Bateson, 



