THE DEVELOPMENT OF A YOUNG MONKEY 121 



finally the baby gave up and, turning aside, began to chatter. 

 Dolly immediately came to him and picked him up. Five 

 minutes later he escaped again. Dolly moved away from him 

 about four feet and stopped, waiting for him to follow. He 

 advanced a few steps then squatted down and looked around. 

 Dolly immediately ran to the window and looked through at 

 Jim, making threats. Baby turned toward the wall and began 

 to chatter. Dolly became excited, ran from one window to 

 the other, growling and barking. The baby became very much 

 frightened, chattering continuously, and Dolly finally ran to 

 him, picked him up, turned him over while running, and climbed 

 to the shelf. 



July 24. It rained almost all day and Dolly remained in the 

 sleeping box on the shelf. I could not coax her out. The baby 

 kept close to her and did not try to escape. 



July 25. Third week. 



Today for the first time I saw the baby use his hand effec- 

 tively. While watching me, he grasped Dolly's left nipple with 

 his right hand and carried it to his mouth. The movement 

 was quick and accurate, quite different from his usual vague 

 cla wings. 



He walks better today, having gained some control of his 

 hind legs. He even managed a shambling trot for a few steps 

 until one of his feet was misplaced, thus upsetting him. He 

 shows little fear when left alone but watches his mother closely 

 and keeps near her. He was out of her arms for about 15 

 minutes during the three hours that I watched. Squatting in 

 front of the wall, he suddenly throws his body forward and 

 thrusts his hands against it, at the same time pursing his lips 

 and drawing up the corners of his mouth. This is repeated 

 frequently and seems to be the first definite attempt at play. 



Baby followed Dolly for about 15 feet. When she stopped 

 and sat down he climbed against her back and began to muzzle 

 about as though seeking her teat. She reached around, caught 

 him by the neck and pulled him into position. 



July 26. Baby was not on the ground during the time that 

 the observer was present. He spent all the time in nursing or 

 sleeping. A day of great activity seems to be followed by one 

 of depression or exhaustion. 



