Payne: Variations and Selection 



31 



say. The necessary tests will be made and the results pub- 

 lished later. It was thought best not to delay the publica- 



TABLE X 



Summary of data of a series of outcrosses of the selection line to the ^vild 





Number 

 3Yith 



Normal 

 Bristle 



Xmnber 



^ umber 

 With 

 Extra 



Bristles 



Per Cent 

 01 JT iie^ 

 JYith 

 Normal 

 Bristle 

 Number 



-Mean 

 Bristle 

 Niunber 



of all 



Ale an 

 Bristle 

 Number 

 of Extras 



First Outcross 













Female, selection line x 













wild male 









-± . oy 



0 . oi 



Fi X Fi 



346 



381 



47.59 



5.08 



6.07 



Second Outcross 













Fo female from first out- 













cross 



OD 



O- 



Do . Do 



i J_C 

 -t . -±o 



X Q 1 

 0 . o4 



Fx X Fi 



431 



428 



50.17 



5.05 



6.11 



Third Outcross 













Fo female from second 













outcross 





77 



85.10 



4.18 



5.23 



Fi X Fi 



484 



254 



65.58 



4.53 



5 . 55 



Fourth Outcross 













Fo female from third out- 













cross 



570 



269 



66.67 



4.51 



5 . 56 



Fi X Fi 



407 



508 



44. 4S 



5 . 13 



6.04 



Fifth Outcross 













Fo female from fourth 













outcross 



602 



372 



61.80 



4.60 



5.59 



Fi X Fi 



3« 



379 



47.36 



5.00 



5.91 



Table X gives a summary of the data of five outcrosses to the Avild. 

 Females from the selection line were outcrossed to wild males. The F/s 

 were inbred. F-- females with extra bristles were crossed to the wild 

 again. The Fi's Avere inbred and the F.. females with extra bristles Avere 

 again crossed to the Avild. This was continued for a fourth and a fifth 

 ou;tcross. The table gives the number of flies with the normal bristle 

 number (four), the number with extra bristles, the percentage of flies 

 with the normal bristle number, the mean bristle number of all flies, 

 and the mean bristle number of the extras. 



tion of the results obtained in the line selected for extra 

 bristles. 



