450 T. H. MORGAN AND C. B. BRIDGES 



Pi 



eosin9 Xw^VP— Xw^VP 

 white pink verm.cf X w v p p 



Fi females Fi males 



X w« V P X w« V P 



X w V p p 



white-eosin eosin c? 

 compound 9 



273 260 



298 227 



We have shown before that the color of an eosin male is the 

 same whether it is pure for non-pink (PP) or heterozygous for 

 pink (Pp). Direct comparison of the Fi males and females 

 above showed no appreciable difference in color between them, 

 so that probably the color of the white-eosin compound is not 

 diluted by heterozygosity for both vermilion and pink. 



In addition to the above we have examined 2,402 more of the 

 white-eosin compounds heterozygous for vermilion and pink, 

 which appeared in the cross below : 



Pi 



white 9 XwVP— XwVP 

 eosin verm, pinkcf X w® v p — p 



*In Culture I there appeared a female having one eye the color of the 

 white-eosin compound and the other eye white. Upon testing her with a vermil- 

 ion pink male she produced 39 red 9 9, 31 vermilion 9 9 , 43 pink 9 9 , 37 verm, 

 pink 9 9 , 61 white d'cf , 8 eosin cfd", 33 cf d" in the double class eos. verm, and 

 eos. pink, and 21 cf cf eos. verm. pink. On the assumption that although one eye 



