534 



MARY B. STARK 



TABLE 4 



low 1 doubtful and 4 high to 7 low ratios where equal numbers 

 of each kind are expected. Further tests were therefore made. 

 Pairs were mated from 13, 1; 13, 2; 13, 5; 13, 7; 36, 12; 47, 7; 

 47, 8; 47, 11. 



The counts from these matings are shown in table 5. 



As expected, the test of 13, 1 shows the presence of a lethal 

 since there were 6 high to 6 low ratios. 



The test of 13, 2 indicates a lethal with 8 high to 11 low ratios. 



The test of 13, 5 indicates a lethal with 6 high to 13 low ratios. 



