was mated to her lowest available brother in each genera- 

 tion with duplicate matings to insure the continuation of 

 the line. In the same way in the high line the female 

 with the highest facet count was mated to her highest 

 brother. 



The data as given in the present paper are grouped 

 under two heads. Tii Table TT and Fig. 1 are included 

 only thos.' individuals in Wir diivet line. In Table III 

 and I'^iu'. 1' lliiTc arc iiicludcd, in addition, the sib matings 

 in each gciu'i'ation. 'I'lic general results obtained from 

 the two groupings are alike, but the data based on all the 

 matings give a smoother curve because of the larger 

 numbers of individuals involved. 



Table I show^s the distribution of frequencies of fac- 

 torial values for eye facet number in the unselected 

 population of white bar, number 127, which served as the 



