A PHYSIOLOGICAL CHARACTER. 



77 



strain of the same line. Examined in detail, the data for reproductive 

 vigor and reaction-time do not appear to be related. 1 



-11,1, 



T T 



300 



FIGURE 11. Line 794. 



A. Reproductive indices, actual values. 



B. Reproductive indices, superiority. 



C. Reaction-time curves. 



LINE 795. 



Line 795 is a sister line of Lines 794 and 796 and was subjected 

 to selection for a like period covering 94 generations for the plus 

 and 95 generations for the minus strain. The data will be found in 

 tables 35 and 36 and in figure 12. 



1 For example, during the first 6 months the plus strain of Line 794 was persistently the 

 more vigorous and generally the less reactive. The 7 high points in figure HA showing high 

 reproductive indices (above 1.75) for the plus strain correspond 4 times with periods of greater 

 reactiveness in the same strain, and 3 times with periods of less reactiveness; 5 similar high points 

 of reproductive indices for the minus strain correspond with 1 period of relatively greater re- 

 activeness in the minus strain and with 4 points of lesser reactiveness. The two-month periods 

 of relatively low reproductive indices for the two strains likewise fail to correspond with periods 

 of lesser reactiveness to light. 



