16 



AN ANALYSIS OF THE EFFECT OF SELECTION. 



The effectiveness of selection is doubtful, but the line runs con- 

 sistently lower than the three plus lines, and reversed selection was 

 perhaps effective. 



TABLE 12. 900, Inbred Minus Line. 



TABLE 13. 



868 MINUS LINE. 



This line is descended from culture 868, which was produced by a 

 sepia, Dichset, ebony-sooty female from 856 and a rough male from 

 852; 856 was the result of mating a stock sepia, spineless, kidney, 

 sooty, rough male to a Dichset ebony-sooty 

 female from 840 (q. v. above, in pedigree of 

 900 line). 852 was a descendant of the peach, 

 spineless, kidney, sooty, rough, and peach- 

 ebony stocks, and (although it did not trace to 

 the Dichset stock) of the same original cultures 

 as 864, the ancestor of the first inbred plus line 

 (see above). 



The offspring of 868 itself were classified for 

 dorso-central bristles, as shown in table 13. 



The data for the succeeding generations are given in table 14 and 

 figure 7. 



The numbers of individuals and of generations are rather small, 

 for the reason that the line was not very vigorous, and finally died 

 out in spite of all attempts to preserve it. It gave the lowest means 

 of any line so far discussed. Reversed selection was apparently suc- 

 cessful. 



