inheritance; of fecundity in domestic fowe. 321 



B.PR. $ Df)8. Indicated constitution = fhU. fkU. 



This bird was purchased in January, IQ08, from Gardner & 

 Dunning, a then well-known firm of Barred Rock breeders of 

 iVuburn, N. Y. Nothing- was known of this bird's previous his- 

 tory or pedigree. The bird was hatched in the spring of 1907, 

 and used in our breeding pens in 1908 and 1909. In 1908 he 

 failed to get any adult daughters. This, however, was not the 

 fault of the bird, but of the conditions under which the breeding 

 had to be done that year (cf. Pearl and Surface 35). From the 

 records of the daughters of $ 58 obtained in 1909 and exhibit- 

 ed below it appears clear that he was a class 7 male. The 

 breeding history is as follows : 



Matings: A. With 9 ? ? indicated to be of class I = fLiL^. Fkk. 



5 Progeny 



Winter Production: Over 30 Under 30 Zero 



Observed 10 13 i 



Expected 12 12 o 



Mean winter egg production of 

 $ ? in indicated class 52.22 eggs 17.25 eggs o eggs 



B. With 4 ? ? indicated to be of class 6 = fkU. Fkk. 



? Progeny 



Winter Production: Over 30 Under 30 Zero 



Observed o 5 



Expected 5 



Mean winter egg production of 



? $ in indicated class 15.80 eggs 



All $ Progeny 



Winter Production: Over 30 Under 30 Zero 



Observed 10 18 i 



Expected 12 17 



Mean winter production 52.22 eggs 16.82 eggs eggs 



The single zero bird here ( ? F158) cannot fairly be regard- 

 ed as a non-conformable case because of the following history. 

 She was hatched March 30, 1909. She never laid an egg and 

 died May 23, 1910. Autopsy showed the ovaiy and oviduct to 

 be in an infantile condition. The ovary weighed i gram and 

 the oviduct 2 grams. The ovary showed no oocytes enlarged by 



