150 CARL R. MOORE 



organ had developed, but despite this fact, each time the at- 

 tempt was made the mascuHnized female repeated exactly the 

 male behavior by licking the normal position of the male organ. 

 The following extract from my notes represents the type of 

 behavior : 



May 29. Normal female in heat, placed in cage with masculinized 

 female (rat I). Mr. F. L. Dunn and the writer watched four un- 

 questionable attempts at copulation, each time masculinized female 

 licks region of penis of male, same as normal male reaction, though 

 no penis is present. Not so enthusiastic as normal male, repetition not 

 so frequent. Same normal female in heat placed in cage with an early 

 spayed female on which no transplantation of testis had been made — 

 no attempt at copulation. 



June 3. Normal female in heat, placed in cage with masculinized 

 female (rat I) — reactions perfect and characteristic of norm. male. 

 Copulation attempted eight or ten consecutive times with only short 

 intervals between attempts, masc. female entirely as enthusiastic as 

 norm, male — each time licks external genitals as does norm, male, 

 before next attempt. Normal female taken from cage for fifteen 

 minutes, returned to cage again. Copulation attempted instantly, 

 just as normal male would have acted. Copulation attempted time 

 and time again, absolutely normal reaction. 



Spayed female without testis showed none other than passing 

 interest toward female in heat, no attempt whatever to imitate act of 

 copulation. Same true of old female, did not attempt to copulate. 



There is absolutely no question as to the occurrence of these 

 reactions, for they could not be more characteristic had the fe- 

 male in heat been placed in a cage with a normal male. The nor- 

 mal female reacts also in an absolutely typical manner towards 

 the masculinized female, just as she would have acted had the 

 masculinized female been a normal male and capable of fulfill- 

 ing the act of copulation. And it is significant that, so far as the 

 writer has observed, neither a normal female in the height of 

 vigor, an old female, nor yet an early spayed female that had 

 not received the testicular transplantation has ever been seen 

 to attempt the act of copulation by assuming the role of the 

 normal male rat. 



It may be remarked that the only psychical reactions that 

 appear to be of value to the writer are those illustrated above, 

 those of the sexual reactions of one rat to another and the ma- 



