INHERITANCE OF FECUNDITY 



191 



B. With 3 9 9 indicated to be of class 2 = fhLo . Fhh. 



9 ProgeiiTj 



Winter Production: Over §0 Under 



Observed 8 



Expected 8 



Mean winter production of 9 9 



in indicated class 59 .00 eggs 



C. With 2 9 9 indicated to be of class 6 = fhLi . FhU. 



Zero 











9 Progeny 



Winter Production: . Over 30 Under 30 Zero 



Observed 3 



Expected 3 



Mean winter production of 9 9 



in indicated class 20.33 eggs 



A II 9 Progeny 



Winter Production: Over SO Under 30 Zero ■ 



Observed 20 15 1 



Expected 20.5 15.5 



Mean winter production 52.20 eggs 16.53 eggs eggs 



Barring the single bird with a zero record the agreement between 

 observation and expectation here is perfect. This exception was 

 a late" hatched bird (June 2, 1910). It laid an egg on May 1, 

 1911, of its pullet year, and died from a combination of pulmonary 

 and intestinal difficulties on May 22. Under these circumstances 

 it obviously carries little weight as an exception to expectation 

 on a gametic basis. 



B.P.R. cf 564. Indicated constitution = fhLo . //iLo. 



This bird was hatched in 1909 and used in the breeding season 

 of 1910, with the following results: 



^^ It must always be I'emembered that 'late' is relative. Under our conditions 

 of climate, etc., at Orono, June 2 represents very late hatching for birds which are 

 to be used in fecundity work. The cold weather comes on so early in the fall and 

 is so severe that any bird not fully developed by the middle of October or the first 

 of November at the lates-t is likely to remain permanently stunted. The first of 

 June represents about the latest possible limit of hatching for fecundity work under 

 these conditions. 



