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



Females of the same composition were obtained by mating 

 eosin vermilion females to eosin pink males. The daughters, 81 

 in number, were like the 264 above. Both were like the dark 

 eosin females, except that the range of variation seemed to be 

 somewhat extended in the direction of dilution. 



WHITE-EOSIN COMPOUND 



When an eosin female is crossed to a white male the daughters 

 are white eosin compounds and the sons are regular eosin males. 

 The eye colors of the sons and daughters are apparently identical. 

 The eye color of the female drops from dark to light eosin: 



Pi 



eosin 9 X w® — X w' 

 white cf X w 



Fi females Fi males 



X w« X w« 



Xw 



white-eosin 



compound 9 eosin cf 



205 149 



489 430 



694 579 

 Gametes of Fi 9 X w^ — X w 

 Gametes of Fi cf X w® 



F2 females F2 males 



Xw^ Xw Zw« Xw 



Xw'' Xw^ 



eosin 9 white- eosincf whitecf 



eosin 

 comp. 9 

 420 357 370 374 



In both these cases the eosin female and the white-eosin com- 

 pound were produced in the same cross and could be easily com- 

 pared, and the difTerence noted above observed. 



The reciprocal cross furnished more data, as follows : 



p white 9 X w — X w 

 eosin cf X w" — 



