INHERITANCE OF FECUNDITY IN DOMESTIC FOWE. 353 



Matings of Barred Plyiiioiifh Rock males and Cornish Indian^ 

 Game females. Two dift'erent males were used successfully" in 

 matings of this sort. Both of these birds were of class 7, having 

 the gametic constitution //1L2. fhU. One of them ( $ 554) was 

 used in a number of pure B.P.R. matings with results already 

 discussed in a previous section. 



Matings of B. P. R. -^ fi^p. Indicated constitution =-- fUL^. 



fku ^ ■ • ■ 



Matings: A. With 9 Cornish $ ? indicated to be of classes 2 or 3 

 = flj,. FLJ, or fLJ,. FIJ,. 



9 Progeny 



Winter Production: Over 30 Under 50 Zero 



Observed 18 17 2 



Expected 18 5 18. s 



Mean winter egg production of 



all 5 + of indicated class ... 46.38 eggs 15.00 eggs o eggs 



If we suppose the two zero birds to represent somatic fluctua- 

 tions the agreement between observation and expectation is 

 very close. Both these zero birds were late hatched and all the 

 facts regarding them in:!icate that they carried L^, but for phy- 

 siological reasons did not bring it to expression. 



B. With I Cornish ? indicated to be of class i = jLJi . FL1I2. 



$ Progeny 



Winter Production: Over 30 Under jo Zero 



Observed 5 i 



Expected 6 



Mean winter agg production of 



all ? ? of indicated class .... 4--75 sggf' 20 eggs 



There is little doubt about this mating being of the type indi- 

 cated, in spite of the one bird laying 'Under 30.' Her winter 

 record was 20 eggs and she was a late (June) hatched bird. 

 She probably carried Z,.2, but this cannot be positively asserted 

 because no male bird from her was mated. Only in this way 

 could the point be settled. 



■■' i.e., got adult daughters. 



