INHERITANCE OF FECUNDITY 213 



All matings of class 3 males are summarized in table 22. 



The evidence for the segregation of high and low fecundity, 

 as measured by winter egg production is quite as clear from the 

 matings of class 3 d' o" as from those of class 7 or class 4 d'd' pre- 

 viously considered. 



Matings of Barred Plymouth Rock males of class 2. Four males 

 of this class were used in the experiments. None of them got 

 a large number of adult daughters. It will be noted from table 

 9 that males of this class (gametic formula /L1L2 . fLik) should 

 produce daughters with winter records 'Over 30' and 'Under 30' 

 in equal numbers regardless of the type of females with which the 

 mating is made. The only basis for classifying the females in 

 such matings is then the breeding behavior of their progeny, and 

 particularly their daughters. 



B.P.R. cT 32. Indicated constitution = fLiLo . fLik. 



This male was hatched from Station stock in the spring of 

 1907 and bred in 1908. Nothing is known of his ancestry except 

 that his mother was a '200-egg' hen. His breeding history fol- 

 lows: 



Matings: A. With 2 9 9 indicated to be of class 1 = fLiL-, . Fljo. 



9 Progeny 



Winter Production: Over 30 Under 30 Zero 



Observed 4 3 



Expected 3.5 3.5 



Mean winter production of all 



9 9 in indicated class 52.50 eggs 14.33 eggs 



B.P.R. d' 57. Indicated constitution = fLiL^ . fLjlo. 

 This male was purchased from Pine Top Poultry Farm, Hart- 

 wood, N. Y. in 1908 and bred as a cockerel that year. 



Matings: A. With 2 9 9 indicated to be of class 2 = fLiLo . FLih. 



9 Progeny 



Winter Production: Over 30 Under 30 Zero 



Observed 2 10 



Expected 1.5 1.5 



Mean winter production of all 



9 9 in indicated class 38.00 eggs 24.00 eggs 



