202 M. F. GUYER AND E. A. SMITH 
in the male-line experiments shown in figures 6 and 7. Again, 
two apparently normal-eyed individuals from the defective line 
have had bad-eyed offspring. But on the other hand, two 
123 12B2, killed 
LL ih ee Len VO Ae 
sex undelermmed 
HWA WAS. HAaKAAYAHAS HAN\ 2EA4 
43Al Y3SAL4Y3AS 43A4 
Fig.6 Inheritance of the defect through the male line. Symbols same as 
in figure 5. 
defective-eyed individuals (fig. 5) may have what appear to be 
normal-eyed young, so that on a strictly Mendelian interpreta- 
tion we should have to suppose that heterozygotes sometimes 
