1919.] PUBLIC DOCUMENT — No. 31. 51a 



A technical study of the mode of inheritance of winter egg 

 production has been completed, and the results are in course 

 of publication. This study deals with the following points: — 



1. The applicability of Pearl's explanation to our data. This is demon- 

 strated. 



2. The develo]3ment of another explanation. 



3. The applicability of this explanation to the data. This is demon- 

 strated, and the points of its superiority over Pearl's explanation pointed 

 out. 



4. Proof that both explanations have weaknesses, which makes neces- 

 sary a state of suspended judgment in regard to their validity. 



5. Methods of proof for future use are presented. 



Another study, also in press, has demonstrated that the 

 so-called interstitial cells of the hen's ovary are probably 

 eosinophilic leucocytes. 



