18 



AN ANALYSIS OF THE EFFECT OF SELECTION. 



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 FIG. 7. 



6 7 8 9 10 11 12 

 FiQ. 8. 



Fio. 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. 



'From FI 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 

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

 consistently lower means than any other here recorded. 



