S04 ME. C. C. HURST : EXPEBIMENTAL STUDIES !|| 



■'■' The'same extracted black was also mated with a liybrid grey 

 E H 35, producing 2 greys and 5 blacks. 



The greys of the second generation have, so far as tested, 

 proved to be of two kinds, pure and hybrid, the former giving 

 all greys, and the latter a mixture of greys and blacks. Out of 

 9 greys tested, 8 have proved to be hybrids containing recessive 

 black, each of the 8 gave a mixture of greys and blacks, and in 

 all there were 48 young, of which 38 were greys and 10 were 

 blacks. 



Tlie matings were as follows : — 



Table 21. 

 Hybrid Grreys bred together (Fg). 



Matings. Grey. Black. 



E H 29 X H 10 4 1 



E B 29 X E H 27 4 1 



E H 30 X H 10 4 1 



E H .30 X H 10 .5 2 



E H .31 X H 12 2 1 



E H 31 X E H 26 3 



E H 32 X H 12 .5 



E H 32 X H 10 4 1 



E II 35 X E H 26 o 1 



E 11 42 X E H 26 2 2 



Total 38 10 



The remaining grey has, so far as tested, proved to be a pure 

 grey, giving 11 grey young when mated with a black and with 



2 hybrid greys. The matings were : — E G 36 x E B 28 giving 



3 greys ; E G- 36 X H 10 giving 4 greys ; and E G 36 X E H 26 

 giving 4 greys. As these numbers are few, it is possible that 

 this individual may yet prove to be a hybrid grey containing 

 recessive black, and further experiments are necessary before we 

 can be quite sure that it is a pure grey, especially as all the other 

 8 greys tested proved to be hybrids. 



Both the gTeys and blacks of the third generation had sijuilar 

 coats to those of the second generation, there being still no 

 return to the original yellow-grey of the Belgian. 



