226 RAYMOND PEARL 



Mating of B. P. R. & 559. Indicated constitution =fliL-2 . fhLo. 



Matings: A. With 9 Cornish 9 9 indicated to be of classes 2 or 3 = fUh ■ 

 FLih or fLih . Fhh. 



9 Progeny 



Winter Production: Over 30 Under 30 Zero 



Observed 18 17 ' 2 



Expected 18.5 18.5 



Mean winter egg production of 



all 9 9 of indicated class. ... 46.38 eggs 15.00 eggs 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 indicate that they carried L^, but for phy- 

 siological reasons did not bring it to expression. 



B. With 1 Cornish 9 indicated to be of class 1 = fLJo . FLJ.. 



9 Progeny 



Winter Production: Over 30 Under SO Zero 



Observed 5 1 



Expected 6 



Mean winter egg production of 



all 9 9 of indicated class 42.75 eggs 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 L^, but this cannot be positively asserted because 

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

 point be settled. 



All 9 Progeny 



Winter Production: Over 30 Under 30 Zero 



Observed 23 ' 18 2 



Expected 2Jt.5 18.5 



Mean winter production 46.09 eggs 15.22 eggs eggs 



Matings of B. P. R. d" 554- This male has been shown above 

 from his mating with Barred Rock females, to be of class 7 with 

 the gametic constitution /ZiLo . fUL^. He was successfully mated 



