606 



RICHARD GOLDSCHMIDT 



these incidents will not be discussed here.) In such cases the 

 normal individual is, in the first case, invariably the last, in the 

 second case invariably the first, to hatch. These facts make it 

 probable that the assumption which is illustrated in figure 3, 

 comes near the truth. On the abscissa the time of development 

 is marked, while the ordinate gives the progress of differentiation 

 (and determination) during development, having reached its 

 end — that means hatching — at the level a-a. The two full 

 lines are then the diagrammatic time-curves of development for 

 male and female. The vertical line (t(FF) signifies the time of 



t ( MM MM, FFi 



Figure 3 



FF FF, Ml 



the initial action of FF, t(M) the same for M and t(MM) the 

 same for MM. We see that the male has completed differen- 

 tiation before crossing the line t(FF), and the female before 

 crossing the line t(M). Female intersexuality can now be pro- 

 duced either by having a less concentrated FF combined with 

 the same M, or by combining the same FF with a higher M. 

 In the first case t(FF) would become t(FFi), lower concentra- 

 tion meaning a longer time of reaction. Having combined with 

 it a slower development, the female curve would become the 

 dotted curve I 9 1, which crosses the line t(M)i at the point a, 

 that is, being a male development .from this point on. In the 

 second case, t(FF) would be left, but t(M) changed into t(M)i; 



