ELIZABETH RAWLS. 



Other experiments were carried on at the same time with the 

 female children of the four best lines, to see if the female was 

 causing the unusual ratios. Twelve of the virgin females were 

 crossed with wild males, with these results: 



TABLE VIII. 



Thus it is shown that it is the female that produces the ab- 

 normal sex ratios, just how, is not apparent at present. 



One hundred and six of the females from the best line with the 

 104 : I ratio were crossed with wild males in order to see whether 

 any of these children had inherited an abnormal sex ratio from 

 their mother and whether the ratio in any case would be as high 

 as that of the mother. The results are as follows in Table IX. 



Thus, although none of the children 1 inherited as high a ratio 

 as their mother showed, at the same time almost all of them 

 inherited a ratio above normal, the majority showing that of 

 their grandmother. 



Another generation was obtained by mating 119 of the virgin 

 females taken from the lines showing a 3 : I ratio to wild males, 

 in order to see whether the abnormal ratio still persisted and if 

 the 104 : I ratio could be recovered again. The general results 

 are as follows: 



1 1 females showed a sex ratio of 3 : i 

 48 females showed a sex ratio of 2 : i 

 60 females showed a sex ratio of i : i 



The exact figures are given in Table X. 



1 Eight females died. 



