SELECTION IN BAR-EYED RACE OF DROSOPHILA. 



377 



lowering, but the next four generations show a complete return 

 to the mean of the stock. 



dlf 1-2 



29<JiJ 



3692 



v 



A , 



d1f2-l6 



38iJ<> 



4622 



'A, A , 



3322 



,_A A 



d1f6-14 



(5-5) 



34 (Jd 



2722 



^ d1f6-19 (f5-5) 



dlf!-3 (dl) 



47c?d 

 5222 



2 a dlfl-4 (dl) 

 /\ 5544 



6122 



d1f3-4 



(f2-l6) 



25dd 



2622 



d1f5-14 



33dd 



4582 



2 <J 



d1f6-9 

 52dd 

 6522 



, A , A i 



dlf6-29 (f5-14) 



l6d<J 

 ,-^\ / 2499 



, A 



d if 5-6 

 (f4-7) 



2(J 



dlf5-l2 

 (f4-7) 

 23d<J 

 3522 



d1f6-15 



3ld<5 



4422 



2 d 



dlf6-21 

 (fS-12) 



A 



M 



d1f6-25 

 (fS-14) 



1622 



30 70 110 150 190 230 270 30 70 110 150 190 230 30 70 110 150 190 230 



FIG. 6. Curves showing the effect of selection in individual lines in Ba, down- 

 ward selections. For other information consult Fig. 2. 



The upward selections were more successful. With the ex- 

 ception of the last generation there is in every case a slight rise 



