THE 'bar eye' mutant OF DROSOPHILA 



521 



TABLE 4 



Minus selection 



Line D 



not be considered as significant because of its irregularity and 

 slight amount. 



The progression of the mean is much more rapid in the plus 

 than in the minus lines. The averages for the three plus selec- 

 tions give respectively increases of 13.9, 18.0 and 9.6. The 



