114 



T. H. MORGAN 



give a percentage of 32.3. It seems to follow that the low per- 

 centages found when the males of the 2:1 ratio are taken alone 

 is probably a disturbance due to viability in the males. 



The linkage of Lethal II with eosin and with vermilion 



As in the last case, the data for vermilion are to be considered. 

 Figure C will serve to show the mode of entrance of the factors 

 into the experiment if the factor V be used in place of M near 



* The male class of XX is omitted because the white long males are far be- 

 hind expectation. 



TABLE 25 



