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 



2.50 

 2.00 



1.50 

 1.00 

 .50 

 00 



-I 



,ViI i 



I! 



3 6 



12-1 4-5 8-9 12-1 4-5 8-9 12-1 4 



1915 1916 1917 



r^ 



-1 1.00 

 .75 

 .50 

 .25 

 00 

 .25 

 .50 



750 



600 



450 



300 



150 



12-1 



4-5 8-9 

 1915 



12-1 



4-5 8-9 

 1916 



12-1 



4 



1917 



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 11a 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. 



