240 EAYMOND PEARL 



Again the numbers involved are too small to be of any particular 

 significance when taken by themselves. They are in conformity, 

 however, with all the other data and therefore have cumulative 

 value. 



Matings of Fi d" 577 with Cornish Indian Game females. Two 

 matings only of this sort got adult female progeny. The families 

 are small. The pure Cornish females used were of constitution 

 fUk . Fkk. The resuhs follow. 



cf 577 fhh . JhLo X fUh ■ Fhh. 

 cT Progeny 



Winter Production: . Over 30 Under 30 Zero 



(9 F7) 1 1 



(9 Fll) 2 1 



Total observed 3 2 



Total expected 1.25 2.5 1.25 



Mean winter production of 9 9 



in indicated class 7.33 eggs eggs 



Matings of Barred Plymouth Rock males with Barred Fi females. 

 While several matings were made here they all fell into one or 

 the other of two gametic types. The Barred Rock males used in 

 these matings have, of course, already had their gametic constitu- 

 tions determined through their matings with pure Barred Rock 

 females. 



A. Type of mating: fhL-i . fhLo X fhLo . FL^U. The results 

 of this type of mating are shown in table 30. 



There are several points which need to be noted about this 

 table. While in general it is apparent that the observed' result 

 falls out in fair accord with expectation, the three zero birds are 

 outstanding exceptions. No zero birds should occur in any of 

 these matings. A careful study of the individual cases, however, 

 indicates that only one of these apparent exceptions is really such. 

 Two of these zero birds were very late hatched and began laying 

 immediately after March 1, i.e., just after the arbitrary point of 

 ending the winter period. Their records during the spring period 

 were such as to indicate that they bore the factor Li, and not that 



