INHERITANCE OF FECUNDITY IN' DOMESTIC FOWE. 355 



Matings: A. With 2 B. P. R. ? ? indicated to be of class i — fL^L;- 



5 Progeny 



Winter Production : Over 30 Under 30 Zero 



Observed 4 14 2 



Expected 15 5 



Mean winter production of all 



? ? in indicated class 51-75 eggs 15.79 eggs o eggs 



The four birds with 'Over 30' records are apparently out- 

 standing exceptions. It should be noted that these birds came 

 from mothers whose gametic constitution was of the general 

 type Li. /v2. This would seem to suggest that in this case the 

 presence of L2 in the mother, even though it did not pass to 

 tny of the /^"-bearing gametes, nevertheless in some manner or 

 other modified the Li in these gametes so that a higher produc- 

 tion in the progeny resulted. In other words, these cases sug- 

 gest 'intra-zygotic influence' of the gametic factors upon one 

 another, such as is frequently suggested by the conditions ob- 

 served in heterozygotes, and lately has been discussed by Daven- 

 port (6, 7) and Laughlin (23). The winter records of these 

 four birds are to be regarded as wide fluctuations, since when 

 bred they gave no indications of carrying P2. 



B. With I B. P. R. ? indicated to be of class 3 = jL^L. Fkk. 



2 Progeny 



Winter Production: Over 30 Under 30 Zero 



Observed 3 i 



Expected 3 i 



Mean winter production of ? ? 



in indicated class 6.00 eggs eggs 



All $ Progeny. 



Winter Production: Over 30 Under 30 Zero 



Observed 4 17 3 



Expected .18 6 



Mean winter production 51.75 eggs 14.06 eggs eggs 



Matings of C.I.G. 8 3i7- Indicated constitution : class 3 

 (C.l.G. 1' S r^ /A/., fhh. 



