AN ANALYSIS OF THE EFFECT OF SELECTION. 



15 



INBRED MINUS SERIES. 



As in the case of the inbred plus series, two lines were carried on 

 here. One of these was not kept long; but its history is given here, 

 chieflv because it was used in producing the crossbred minus line. 



900 Line. 



Culture 900 produced Dichset flies as shown in table 11 

 This culture was produced by mating a male 

 from the sepia, spineless, kidney, sooty, rough 



Table 11. 



stock to a female of the constitution 



D^ r. 



s^ e 



that 



was obtained by inbreeding a pair of flies from 

 869 (see pedigree of 1002 inbred plus line). 

 869 was produced by a male from the sepia, 

 spineless, kidney, sooty, rough stock and a fe- 

 male from 854, which came from 839 (9) and 840 {&). 840 also 

 enters into the pedigree of the 868 line, below. 839 and 840 were 

 sister pairs, the males coming from the sepia, spineless, kidney, sooty, 

 rough stock, and the females being Fi hybrids of the sepia, peach, 

 ebony, and Dichset stocks. 



10 11 



Fig. 5. — Means and standard deviations for crossbred plus line. 

 Fig. 6. — Means and standard deviations for 900 inbred minus line. 



Table 12 and the curve (fig. 6) for this line are arranged in the same 

 way as those for the inbred plus lines. 



