SELECTION IN BAR-EYED RACE OF DROSOPHILA. 



375 



The downward selections were^not very effective. In the 

 first generation the average facet number in the females actually 

 rose above that of the stock, but the average of the males dropped 



A, A , 



d series ft 

 85d<5 

 7888 



f2 



142d<J 

 164SS 



66ti 



8122 



f4 

 53<5<5 



6288 



30 70 110 150 190 230 270 



I A 



u series f 1 



161JJ 

 19728 



f2 



240<3d 

 24188 



f2, reverse 



5544 

 6928 



28122 



f 3, reverse 

 41cJ<J 

 5282 



f4 



181(5(5 

 20288 



30 70 110 150 190 230 270 310 350 390 430 

 FIG. 5A. 



considerably below. In the next generation the females dropped 

 decidedly and the males dropped only slightly. The third gener- 

 ation produced another slight lowering of the means, and after 

 that there was a gradual return toward the mean of the stock. 



