FERTILITY AND STERILITY IN DROSOPHILA 



183 



TABLE 9 

 Showing the number of offspring produced by 112 pairs of the hybrids in 30 days 



though the hybrids are long lived as shown by the fact that in 

 this experiment at the end of thirty days 81 per cent of the flies 

 were still living. Twenty-four males and 31 females had died. 

 The death rate was not selective but was about equal in both the 

 cross and its reciprocal. 



Table 10 gives evidence on the same question — the output of 

 the hybrids as tested in pairs. In this experiment the hybrids 



TABLE 10 



Showing production of the hybrids of the crosses between the truncate stock and the 



Woods Hole stock 



TABLE 10 a TABLE 10 b 



Fi generation from truncate 9 X Reciprocal cross : Fi generation from 



Woods Hole cf truncate cf X Woods Hole 9 



1 

 2 

 4 

 5 

 8 

 9 

 10 

 11 

 13 

 14 

 16 

 17 

 18 

 19 

 20 

 22 

 24 



TOTAL 



64 



98 



96 



103 



143 



90 



96 



100 



53 



167 



101 



171 



142 



87 



126 



238 



178 



2053 



TOTAL GRAND 

 9 TOTAL 



83 

 130 

 119 



95 



169 



^117 



'no 



140 

 67 

 138 

 139 

 186 

 150 

 100 

 146 

 244 

 215 



2348 



147 

 228 

 215 

 198 

 312 

 207 

 206 

 240 

 120 

 305 

 240 

 357 

 292 

 187 

 272 

 482 

 393 



LIFE 

 OF cf 



27 

 20 

 27 

 54 

 24 

 20 

 27 

 45 

 20 

 40 

 40 

 54 

 63 

 33 

 27 

 39 

 33 



LIFE 

 OF 9 



4401 593 







259 35 



20 ■ 



24+ 



33 



27 



35 ± 



24 



33 



24 



15 



27 



33 



54 



20 



49 



33 



49 



40 



540 



32 



