No. 600] EXPERIMENTAL INTERSEXUALITY 717 



male individuals. But this has so far never been the 

 case. In order to understand it we have to point now to 

 a fact which we omitted in our previous discussions. We 

 have located the intersexual animals, males and females, 

 at a certain point between the two sexes, as represented 

 in the two diagrams. But in fact these points are only 

 the mean of a certain range of variation in regard to the 

 grade of their intersexuality. Whether this means that 

 the potencies of the factors are variable or only their 

 ultimate effect shows variation produced through influ- 

 ences during the development, is a question not to be 

 discussed here. The fact is, however it might be caused, 

 that the value of e as the measure of intersexuality, is 

 variable around a mean. If this is the case, the following 

 expectations are to occur (Fig. 3) : If the values of e 



approach the epistatic minimum (20 and — 20 in our dia- 

 gram), then a point must be reached where the vari- 

 ability-curve stretches beyond this limit. That means — 

 Cllrve 1— that in cases of low grade intersexuality some 

 -f or — individuals might overlap into the normal. Of 

 course any position of these curves and a corresponding 

 numerical relation of normals and very slightly inter- 

 sexual animals might be met with, as the curves 2 and 3, 

 Fig. 3, indicate. And indeed such cases have been found 

 as well on the female as on the male side. Types of this 

 kind, realized in the F 2 crosses with male intersexuality, 

 are those with which we have dealt in the previous para- 

 graph. Thus far all facts agree with this conception, in 

 one culture up to F 5 . Further checks are in progress. 



But there is another possibility for the production of 

 intersexual males. Let us assume that we could find two 

 races of the following constitution : 



Strong race ? = |FF] Mm <$=\ff\ MM, 

 100 60 100 60 60 



