152 ROSCOE R. HYDE 



TABLE 13 f 

 Inbred 9 No. 151 X Woods Hole d", reciprocal of 13 c 



Sterile 



This experiment brings out the following facts. In the sterile 

 female stock (inbred) used as a control 39 pairs out of 110 pairs 

 were sterile. In the Woods Hole stock 4 pairs out of 70 pairs 

 were sterile. In the Fi generation only 12 pairs in 351 proved 

 sterile. Of those tested 5 were females, 4 were males. In the 

 F2 generation 1286 pairs were tested, 195 of which were sterile. 

 There were 153 sterile females and 15 sterile males. The sterility 

 of the female reappeared in both the cross and the reciprocal, 

 indicating that both the brothers and sisters of the affected 



