SEX BIOLOGY AND SEX PSYCHOLOGY 147 



with adrenal tumours frequently develop moustache 

 and beard and other appanages of the male. One 

 presumes that a slight preponderance of the adrenal 

 cortex in the normal endocrine make-up will lead 

 to a less feminine type of woman than normal. I 

 repeat that we are but on the verge of the matter and 

 that premature speculation is certainly risky and 

 probably fallacious. But all the same, there is 

 very little doubt that we are on the right track, and 

 that we shall have to search for the fmer shades of 

 temperamental difference between man and woman 

 not so much in differences in the quality of the secre- 

 tion of testis or ovary as in differences of balance in 

 what the Americans call the "endocrine make-up." ^^ 

 There is, however, also the possibility of difference 

 in the quality of gonad secretion, and of recent years 

 Steinach and his followers have been claiming that 

 this may be at the bottom of many cases, of so-called 

 "perversion of sexual instinct." The latest claim of 

 this school is that homosexual men may be rendered 

 heterosexual in instinct by removal of their testes 

 and implantation of a testis from a sexually normal 

 person — from a man, for example, who is being 

 operated on for cryptorchidism. It is frankly im- 

 possible as yet to say whether their conclusions are 

 well founded: a very much larger series of cases will 

 be necessary, and the possibility of suggestion's ac- 

 tion must be eliminated. It is well to remember, 

 however, that there is no theoretical objection to the 



11 See Vincent, '21; Harrow, '23. 



