INHERITANCE OF FECUNDITY 193 



B.P.R. d" D58. Indicated constitution = fliL^ . fhLo. 



This bird was purchased in January, 1908, from Gardner & 

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

 Auburn, 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 d" 58 obtained in 1909 ancl exhibited below it 

 appears clear that he was a clas§ 7 male. The breeding history is 

 as follows : 



Matiiigs: A. With 9 9 9 indicated to be of class 1 = /LiL. . Fhk- 



9 Progeny 



Winter Production: Over 30 Under 30 Zero 



Observed 10 13 1 



Expected 12 12 



Mean winter egg production of 



9 9 in indicated class 52.22 eggs 17.25 eggs eggs 



B. With 4 9 9 indicated to be of class 6 = fUU ■ Fhh. 

 , 9 Progeny 



Winter Production: Over 30 Under 30 Zero 



Observed 5 



Expected 5 



Mean winter egg production of 



9 9 in indicated class 15.80 eggs 



All 9 Progeny 



Winter Production: Over 30 Under 30 Zero 



Observed 10 18 1 



Expected 12 17 



Mean winter production 52.22 eggs 16.82 eggs eggs 



The single zero bird here ( 9 F158) cannot fairly be regarded 

 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 ovary and oviduct to be in an 

 infantile condition. The ovary weighed 1 gram and the oviduct 



