CASTLE. — INBREEDING, CROSS-BREEDING, AND SELECTION. 741 



TABLE II. 



Result of Selecting Pairs Simultaneously from Broods of Different 

 Size but of Similar Ancestry in Series A. 



This summary shows an unmistakable tendency for the larger parental 

 brood to produce larger filial broods, but not so much larger as the differ- 

 ence in the parental broods would lead us to expect. In other words, 

 there occurs regression toward low productiveness, which is a fixed racial 



