154 



ROSCOE R. HYDE 



The truncate stock shows only a sHght degree of sterihty (table 

 8, F49). The crosses themselves bear out this statement, for, 

 out of the 24 pairs, all are fertile (table 16). Two died, however, 

 before their fertility could be established and are not recorded in 

 the table. Of the 251 pairs tested in the Fi generation there are 

 only 2 sterile individuals; a male and a female. The behavior 

 of the sterility is the same in the cross as in the reciprocal. If the 

 sterility behaves like a character which segregates and recombines 



TABLE 14 b 

 Woods Hole cf X inbred ? No. 31; reciprocal 14 a 



* Sterile 9 



TABLE 15 a 



Crosses between the inbred stock and the truncate stock showing the behavior of 

 sterility in the Fi and F^ generations. Inbred 9 No. 31 X truncate cf No. 35 



♦Sterile 9 



