37 



p. 36 (Fig. 3). 



Given a definite quantity of the factorial substance and 

 identical conditions, the velocity of the reaction is con- 

 stant. Thus the final result depends upon the amount of 

 the factorial substance present and the independently in- 

 herited rapidity of differentiation, which determines the 

 situation of the growth-stages on the abscissa (the dotted 

 lines). Thus the above quoted facts as well as the multi- 

 tude of details not mentioned can be easily derived from 

 this graph. The last named mosaics are of course the ex- 

 pression of small differences in the velocity of differen- 

 tiation in symmetric halves of the body, which are well 

 known to embryologists. 



These conclusions in regard to the real character of 

 multiple allelomorphs are the same as those derived from 

 other characters in the same objects. In our work on 

 intersexuality we were able to prove, to as great an extent 

 as a genetic proof can possibly be carried, that the dif- 

 ferent geographic races of the same moth differ in re- 

 gard to the absolute and relative quantities of the sub- 

 stances, which we call the sex-factors. In the genetic 

 language of the present day we should call them, there- 

 fore, multiple sex-allelomorphs, a conception which indeed 

 we have always used (without this recent term) since our 

 first report about this work in 1911. In the case of inter- 

 sexuality we can furnish facts very similar to those about 

 the caterpillars, if we consider certain features of the 

 wing colors. In normal males a certain amount of pig- 

 ment covers the entire wing, whereas the female wing is 

 unpigmented. This pigment is formed by the oxidation 

 of a chromogen deposited within the scales. There it 

 flows from the wing veins with the blood. By a detailed 

 analysis we are able to show that an intersexual male is a 

 genetic male which developed as such up to a certain 

 point when the development suddenly began to continue 

 under the aspects of femaleness. One of the results of 

 male metabolism is the production of these chromogens 



