596 RICHARD GOLDSCHMIDT 



111 



In studying the intersexual individuals of the different types 

 which we bred, we reahzed from the very beginning the strange 

 correlation, or rather lack of correlation, in regard to the inter- 

 sexuality of the different organs. The idea of intersexuality, 

 something between the two sexes, leads to the expectation that 

 an intersexual individual should represent in every organ a 

 definite intermediate step between the two sexes, equally dis- 

 tant from the endpoint for every organ. But this is not the 

 case. In low intersexuality some organs are intersexual and 

 others are not. In higher grades the hitherto unchanged organs 

 follow and become a little intersexual, whereas those which first 

 changed exhibit a higher grade of intersexuality. In still 

 higher intersexuality the latter may have already assumed com- 

 pletely the characters of the other sex, while the others are 

 still highly intersexual. Intersexuality is, therefore, so to 

 speak, a macroscopic phenomenon. In reality, an intersexual 

 animal of the per inspectionem type is a mosaic of organs of dif- 

 ferent determination in regard to their sexuality. This very 

 important fact will be seen in the photographs of almost com- 

 plete series of female and male intersexuality in figures 4 to 

 35, as well as in the descriptions and illustrations in our earlier 

 papers. (A Qormal female and male for comparison are shown in 

 figures 18 and 19.) The series of female intersexuality ^ should 

 begin with an animal which is externally indistinguishable from 

 the one shown in figure 4. The internal difference is that it is com- 

 pletely fertile whereas the animal pictured here is already sterile, 

 owing to the closing of the female sex-opening. The first visible 

 sign of intersexuality — not well sho-wTi in the picture — is that 

 the antennae have become slightly feathered. The series for the 

 antennae goes as far as figure 13 where the antennae are prac- 

 tically male. The next organ which is affected is the wing- 

 color. In the animal of figure 5 minute streaks of male, brown 

 pigment already appear along some veins on the left wings, and 

 this phenomenon now increases in the series until the male 



' There are two different series of female intersexuality, as has been com- 

 municated in former publications. This one has not been published before. 



