228 RAYMOND PEARL 



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

 ing exceptions. It should be noted that these birds came from 

 mothers whose gametic constitution was of the general type 

 Li . Li. This would seem to suggest that in this case the pres- 

 ence of Li in the mother, even though it did not pass to any of the 

 /^-bearing gametes, nevertheless in some manner or other modified 

 the Lx in these gametes so that a higher production in the progeny 

 resulted. In other words, these cases suggest ' intra-zygotic 

 influence' of the gametic factors upon one another, such as is 

 frecjuently suggested by the conditions observed in heterozygotes, 

 and lately has been discussed by Davenport (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 F^. 



B. With 1 B.P.R. 9 indicated to be of class 3 = jUh . FhU. 



9 Progeny 



Winter Production: Over 30 Under 30 Zero 



Observed • 3 1 



Expected • 3 1 



Mean winter production of 9 9 



in indicated class 6.00 eggs eggs 



All 9 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. cf 557. Indicated constitution: class 3 



(C.I.G.) cf = fUk . fkk. 



Matings: A. With 6 B.P.R. 9 9 indicated to be of class 2 = /L1L2 . FLik. 



9 Progeny 



Winter Production: Over 30 Under 30 Zero 



Observed 17 



Expected 17 



' Mean winter production of 9 9 



in indicated class 12.88 eggs 



