436 



T. H. MORGAN AND C. B. BRIDGES 



Red heterozygous for white and pink 



Data for crosses involving pink and white have appeared in 

 Science, vol. 33, 1911, and the Journal of Experimental Zoology, 

 1911. We obtained the following additional data in order to 

 study the eye color more critically. 



These results given below are from single-pair cultures except 

 those marked (m) which are in mass. In the Fi culture IX 

 (mass) there appeared in addition to the 159 red males, two white 

 males. In Fi culture X (pair)" there appeared in addition to the 

 twelve red males, four white males, two of which were tested 

 but proved sterile: 



