SUPPLEMENTARY NOTES ON TWINS IN CATTLE. 



57 



The idea that I have expressed elsewhere (1917) that the vari- 

 able degree of intersexuality exhibited by free-martins may be a 

 function of the time of onset, intensity, and perhaps duration of 



Fig. 4. Anatomy of the urinogenital system of the free-martin of Case 81, 

 14 cm. long. Described in the text. Greatest length about 14 cm. 1. Gonad; 

 2. Rudiment of cornua uteri ; 3. Gubernaculum ; 4. Cut end of umbilical ar- 

 tery ; 5. Wolffian duct; 6. Seminal vesicles; 7. Allantoic stalk reflected; 8. 

 Ureter, (x 2.) 



action of the male sex hormones requires qualification or sharper 

 definition. The case we are considering would seem to have af- 

 forded the maximum opportunity in these respects, without the 

 maximum result following. It should, however, be borne in mind 

 that no one has yet investigated the stages of the free-martin from 



