A PHYSIOLOGICAL CHARACTER. 



29 



TABLE 3. Summary of selection data by broods for Line 695 plus. 



This is the original brood from which selections were made for the beginning of both the plus and 

 minus strains. 



b Mean reaction-times in italics are those for which there is a corresponding mean for a brood tested on 

 the same day in the minus strain. 



Selection was repeated from the later brood because of the loss of the earlier brood. 



