THE DEVELOPMENT OF A YOUNG MONKEY 127 



he is somewhat left-handed. Today, however, he grasped first 

 at various objects 17 times with the right hand and 13 times 

 with the left. Later, more extensive observations show that he 

 is practically ambidextrous. 



August ji. Eighth week. 



Monkeys were fed green corn on the cob and syrup soaked 

 rolls. They are especially fond of the latter. The mother 

 immediately took possession of the rolls, after husking the corn. 

 She carried both to the shelf. She forced the young monkey 

 out cf her arms. He began to eat in a half-hearted way at 

 the corn but tired of it and approached the mother and reached 

 out for the rolls. This led to severe and continued chastise- 

 ment. She first pulled him away, holding him on level with 

 her eye, and looking fiercely at him all the while. Then cuffed 

 him with the paw, and bit him upon the skin of the head and 

 back. The young monkey was forced to keep out of her reach. 

 He became very angry, chattered and hopped up and down in 

 one place, which seems to be the simian infantile way of ex- 

 pressing anger. He left the mother for the whole length of 

 the plank and concealed himself behind the sleeping box. When 

 I made noises designed to frighten them she would go over to 

 the young monkey and place him in position but would not 

 allow him to nurse. She will not allow him to touch food which 

 she is holding in her hands. The forcing away of the young 

 monkey and her increasing unconcern about him lead us to 

 believe that this is about the time that weaning begins under 

 natural conditions and at this age (seven weeks) he might 

 easily be removed from the mother. 



September 2. The young monkey is in a very playful mood. 

 Spent nearly an hour out of mother's arms. Practiced jumping 

 and climbing most of the time. Co-ordination much more 

 advanced. Began climbing up about two feet on the wire 

 netting, then turning with back to wire and jumping two feet 

 into yard. Did this several times. Began new set of play 

 movements; climbed up 18" to 20" and then turned back to 

 netting, held on with right hand and slowly put left up over 

 shoulder and back until he caught the wire and remained in 

 that position for several moments. He seemed to get a good 

 bit of fun out of this for he did it several times. Would crumple 



