STURTEVANT 



131 



Table 7 



X r V y. J f^ 6 



ing tests. The type was also obtained 

 in another experiment; and its appear- 

 ance and mutation behavior will be 

 described later. This series shows the 

 same excess of rounds over double 



forms as did the bar series, and the 

 explanation is doubtless the same. The 

 difficulty of separation is even greater 

 here, owing to a greater variability in 

 eye size (see below). 



Table 8 



jBlfJ XfB'fu$ 



Bar-over-infrabar females of three those of double-bar. These must evi- 



different constitutions have been dently have bar and infrabar in the 



tested. They have produced rounds, same chromosome. Tables 9, 10 and 11 



and also a new double type that had show these results. In most cases the 



eyes only very slightly larger than fathers of these cultures did not carry 



fB^ 

 Bfu 



Table 9 



9 X various $ $ 



fused; for this reason the females, tected, are not listed. The forked fused 

 among which no mutants were de- mutant male was sterile, but the con- 



