Internal Secretions and Secondary Characters 



The normal male and the normal female of the Brown Leghorns (top) are unlike in 

 -certain characters. The capon (middle), a male bird from which the testes have been re« 

 moved early in life, has some of the characteristics of the male, but lacks others, partic- 

 ularly the large comb and wattles. If the testes are removed from a male bird and the 

 ovary of a female is then engrafted into the body, the maturing bird develops certain 

 traits that are definitely feminine (bottom). Photographs through courtesy of Dr. H. D. 



