A PHYSIOLOGICAL CHARACTER. 



87 



random. Because of this fact, the data for 4 months (October 1916- 

 January 1917) are not very complete and the differences for those 

 2 two-month periods are not to be credited to the same extent as 

 the differences for the remainder of the experiment. 



Reference to tables 48 and 49 (columns 5 and 6) and figure 15 

 and 18s shows that this consistent divergence in reactiveness be- 



FIGURE 14. Line 740. 

 A. Reproductive indices, actual values. B. Reproductive indices, superiority. 



900 



750 - 



600 - 



450 - 



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

 1912 1913 1914 1915 1916 



300 - 



FIGURE 15. Line 740. 

 Reaction-time curves with reaction-time curves for Line 757 superimposed. 



