194 RAYMOND PEARL 



2 grams. The ovary showed no oocytes enlarged by yolk deposi- 

 tion or enlarging. There was no evidence that the ovary had 

 ever shown the slightest trace of functional activity. But a 

 normal bird hatched in March will exhibit signs of ovarian activity 

 before May of the following year, even though she belongs genet- 

 ically to the 'Zero' class in respect to winter production 

 and does not lay. While the autopsy showed no obvious lesion 

 of ovary or oviduct, this by no means proves that there may not 

 have been present some deep-seated functional derangement. 



B.P.R. cf 573. Fndicated constitution = fliLo . flxL^. 



This bird was used in the breeding season of 1910, having been 

 hatched in 1909. He proved not to be all that might be desired 

 as a breeder, being somewhat lacking in vigor of constitution. 

 Partly on this account, he got comparatively few adult daughters, 

 as indicated in the following breeding history. 



Matings: A. With 5 9 9 indicated to be of class 1 = JL1L2 . FUh. 



9 Progeny 



Winter Production: Over 30 Under 30 Zero 



Observed 41 6^ 



Expected 5.5 5.5 



Mean winter production of 9 9 



in indicated class 47.50 eggs 15.67 eggs 



B. With 2 9 9 indicated to be of class 2 = fLiL. . FUh. 



9 Progeny 



Winter Production: Over 30 Under 30 Zero 



Observed 4 



Expected 4 



Mean winter production of 9 9 



in indicated class 49 . 25 eggs 



C. With 1 9 indicated to be of class 3 = fLiU • Fhh. 



9 Progeny 



Winter Production: Over 30 Under 30 Zero 



Observed 2 1 1 



Expectzd 2 2 



Mean winter production of 9 9 



in indicated class 55.50 eggs 16.00 eggs eggs 



