18 



AN ANALYSIS OF THE EFFECT OF SELECTION. 



12 3 4 5 6 



4 5 6 7 8 9 10 11 12 



Fig. 7. 



Fig. 8. 



Fig. 7. — Means and standard deviations for 868 inbred minus line. 

 Fig. 8. — Means and standard deviations for crossbred minus line. 



Table 15. — Crossbred Minus Series. 



J From Ft of the inbred speck line described later. 



Table 16 and figure 9 show the result. The break after F 8 represents 

 the same treatment as that given to the 1002 line (p. 10) — i. e., two 

 generations of unselected mass cultures. 



This line gives perhaps the clearest evidence of the effectiveness of 

 selection that we have yet observed. Reversed selection begun in 

 F 2 was apparently also successful. Finally, the line after F 2 gives 

 consistently lower means than any other here recorded. 



