INHERITANCE OF FECUNDITY IN DOMESTIC EOWE- 361 



to the nature of the matings. The different matings will be dis- 

 cussed in the following order. 



1. F^ $ (out of B.P.R. $ X C.I.G. 5 ) X ^'1 ? ? , barred 

 and non-barred. 



2. F^ $ (out of C.I.G. $ X B.P.R. 5 ) X P^ 5 9, barred 

 and non-barred. 



9 



Ft $ (out of B.P.R. $ X C.I.G. o ) X B.P.R. 9 5 



F S (out of B.P.R. $ X C.I.G. 9 ) X C.I.G. 9 9 



Fi $ (out of C.I.G. S X B.P.R 9 ) X B.P.R. 9 9 



F. $ (out of C.I.G. $ X B.P.R. 5 ) X C.I.G. 9 9 



B.P.R. $ S X Fr Barred 9 9 



B.P.R. S $ X Fi non-barred 9 9 



C.I.G. $ XFi99 Barred and non-barred 



It will be recalled that the barred Fi females come from the 

 mating B.P.R. $ X C.I.G. 9i and that the non-barred (black) 

 Fi females comes from the reciprocal mating C.I.G. $ X' B.P,R. 

 9. 



Matings of Ft $ 5/(5 zvith Fi females. The pedigree of Fi 

 $ 576 was as follows.: 



B.P.R. s 559 (fhU fhL.) X C.I.G. 9 456 (fU.. Fhh) 

 . Fi $ 576 



The hereditary constitutions of both $ 559 and 5 456 were 

 known, both from their pedigrees and their progeny in other 

 matings. From this pedigree it is evident that the gametic 

 formula for $ 576. must be either fhL^. fLih or fliL4UU. A 

 study of his progeny in all matings .shows clearly that it is 

 actually the former. In other words he produced gametes of 

 four kinds, viz., fUL-., fL^L-., fL^l^, fhh.. 



This bird was mated with barred /A 9 9 which had been pro- 

 duced by the following mating. 



