INTERSEXES 



255 



series. In one series the females are finally all changed 

 over into males ; in the other series the males are changed 

 over into females. The former change is spoken of as 

 female intersexuality ; the latter, as male intersexuality. 

 Without attempting to review the long series of experi- 

 ments from which the evidence has come, Goldschmidt's 

 theoretical deductions may be stated as briefly as possible. 



Xi 



J*' 



/> 



b 



Fig. 140. 

 a, Male and b, female of Lymantria dispar; c and A two inter- 

 sexes. (After Goldschniidt.) 



The formula he uses for the male is MM and for the 

 female Mm ; in other words, the WZ-ZZ formula. In addi- 

 tion, however, Goldschmidt adds another set of sex-de- 

 termining factors that at first he called FF, which stand, 

 in a way, for femaleness. The male factors are supposed 

 to segregate, as do Mendelian factors in general, but the 

 FF factors do not segregate and are transmitted only 

 through the ^g^. They were supposed to reside in the 

 cytoplasm, although Goldschniidt has later shown an in- 

 clination to locate them in the W-chromosome. 



