SEXUAL TENDENCIES IN MONKEYS 309 



Situation 10. Females at large in a band containing males 

 are given access to a male dog. 



Observation 16. 5-Maud-M-r and 3-Kate-M-r, both sexually 

 mature, were at large with a band containing males. A small 

 mongrel dog visited the yard now and then. On his approach 

 all of the monkeys would take to the trees and chatter threaten- 

 ingly. But Maud finally descended to the ground and assumed 

 the female position for copulation. The dog mounted her, dog- 

 fashion, and partially entered her. She displayed marked 

 sexual excitement, and ever thereafter would descend to the 

 ground and copulate with the dog whenever he entered the yard. 

 Kate would descend to the ground and assume the sexual position, 

 but would flee before the dog could embrace her. Maud finally 

 offered herself to a strange dog, and the animal bit off her arm. 

 Since then all of the monkeys have shown hostility to dogs. 



Situation 11. Male monkey in contact with human. 



Observation 17. 8-Jimmy I-M-c (sexually mature), while at 

 large with a female, discovered a human infant lying in a hammock 

 outdoors. The infant was too young to caress the monkey, 

 but Jimmy I promptly endeavored to copulate with the infant. 



Observation 18. 14-Jimmy II-M-r invariably attempts to 

 copulate with my hand whenever I stroke him, in spite of the 

 fact that he has been repeatedly cuffed for it, and has never 

 been encouraged in such behavior. 



Situation 12. Mature male, after a week of confinement 

 without companions. 



Observation 19. Of all my male monkeys only 6-Jocko-M-r 

 (mature) has been observed to masturbate. After a few days 

 confinement he would masturbate and eat part of his semen. 

 I have reason to believe that he lived under unnatural conditions 

 for many years before I acquired him. In view of this fact that 

 not one of seven sexually mature monkeys masturbated after 

 several weeks of isolation under conditions that favored a fairly 

 healthy mental and physical life (close proximity to other mon- 

 keys, large cage, warm climate), I am inclined to believe that 

 masturbation is not of normal occurrence among monkeys. 



Situation 13. Mature female, after a week of confinement 

 without a companion. 



Observation 20. 3-Kate-M-r, after a week of isolation, smacked 

 her lips and assumed the sexual position whenever the male in 



