INHERITANCE OF FECUNDITY 187 



The 'Over 30 'birds produced on the average, nearly four times 

 as many eggs in the winter period as the 'Under 30' birds. 



B.P.R. & 567. Indicated gametic constitution = fliL^ . fhL-i. 



This male was used in the breeding season of 1910 and sired a 

 fairly large number of chicks of which the adult daughters appear 

 below. He was hatched in the spring of 1909. 



Mating^: A. With 5 9 9 indicated to be of class 1 = /LiL. . FIJ.. 



9 frogeny 



Winter Production: Over 30 Under 30 Zero 



Observed. ' 7i 9| 



Expected.: 8.5 8.5 



Mean winter production of 9 9 



in indicated class 57.28 eggs 14.78 eggs 



B. With 3 9 9 indicated to be of class 2 = /LiLo . FLih 



9 Progeny 



Winter Production: Over 30 Under 3) Zero 



Observed 12 2 



Expected U 



Mean winter production of 9 9 



in indicated class 55.83 eggs 22.00 eggs 



C. With 2 9 9 indicated to be of class 6 = fhL-, . FhU. 



9 Progeny 



Winter Production: Over 30 Under 30 Zero 



Observed 1\ SJ 



Expected 5 



Mean winter production of 9 9 



in indicated class 48.00 eggs 14.00 eggs 



All 9 Progeny 



Winter Production: Over 30 Under 30 Zero 



Observed 21 15 



Expected 22.5 13.5 



Mean winter production 55.95 eggs 15.64 eggs 



It will be noted that there are two exceptions in these matings. 

 A class 7 cf X class 2 9 should give only daughters in the ' Over 

 30' class. Two out of the 14 adult progeny from matings of this 

 type laid fewer than 30 eggs in the winter period. The record of 



