Physiology, Physiological Chemistry and Experimental 



Pathology of the Testis Homer Wheelon 



Introduction Dual Function of Testis The Evolution of Factors Character- 

 izing Sex Relation of Reproduction to Sex Evolution of Genital Organs 

 Sexual Instincts Nonreproductive Tissue Associated with and Estab- 

 lishing Sex Relationship between the Testes and the Male Secondary 

 Sexual Characters The Relation of Somatic Sex Character to Secondary 

 Sexual Characteristics The Relationship between the Interstitial Cells 

 of the Testes and the Secondary Sexual Characters Effects of the X-rays 

 on the Testis Effects of Vasectomy on the Testis and Sex Characters 

 Functions of the Internal Secretion of the Testes Influence of the Tes- 

 ticular Hormone upon the Development of the Generative Organs In- 

 fluence of the Internal Secretion of the Testes upon the Established 

 Sexual Organs Influence of the Internal Secretion of the Testes upon 

 Nervous Structures and Their Functions Influence of the Internal Se- 

 cretion of the Testes upon Growth and Metabolism The Pharmaco- 

 dynamics of the Testes Alterations in Sex and Their Relation to the 

 Testes Assumption of Male Characteristics by the Female Sex-Inter- 

 grades Conclusion Purpose of the Testicular Hormone. 



