No. 600] EXPERIMENTAL INTERSEXUALITY 711 



explain the fundamental experiment f Suppose we have 

 two races both normal in regard to the quantitative be- 

 havior of their sex-factors, but with different absolute 

 values of the potencies. The values are supposed to be 

 the following: 



Weak European Race Strong Japanese Race 



? @Mm [ff| Mm 



80 60 100 80 



c? IFF] MM gMM 



80~ 60 60 100 80 80 



It is evident that both races, if bred true, behave nor- 

 mally. Here we must now add that the female factors 

 or anlagen are inherited exclusively maternally, without 

 any paternal influence. Therefore the square. But the 

 M's are typical Mendelian sex-factors. Let us cross now 

 a Japanese ? with an European J\ Fj is then 



F 2 ? [?f1 Mm, F x c? [FF] MM. 



The value e is then + and — 40, the offspring is normal. 

 The reciprocal cross European female with Japanese 

 male gives 



Fj $ [ff] Mm, F t <? [ffJ MM. 

 80 80 80 80 60 



Now we see that in the female e or FF — M = 0. The 

 animal is intersexual, exactly half-way between male and 

 female. 



Instead of deriving further theoretical expectations 

 we shall now see how the experimental facts fit these 

 general conceptions of a quantitative nature of sex-de- 

 termination. The first point is of course the question of 

 the different absolute and relative potencies. There are 

 primarily two ways open for testing it. One is to influ- 

 ence these potencies experimentally. Only a few pre- 

 liminary steps in this direction have thus far been made, 



