THE DEVELOPMENT OF A YOUNG MONKEY 115 



young monkey nor did the female show, even up to the time of 

 parturition, any signs of pregnancy which could be noted by 

 external cursory examination. The time of gestation is there- 

 fore not determined. 



Since we desired to keep the young monkey in good health 

 no attempt was made to separate it from its mother. For this 

 reason the notes are rather superficial — such as could be ob- 

 tained by watching the animal's activities in the open yard. 



July ii, igi2. First week. 



The young monkey, a male, was born between 9 and 10 A. M. 

 First observation at 1 P. M. The mother (Dolly) was sitting 

 on the shelf, 1 crouched on her haunches and bent over. She 

 supported the baby between her thighs, one of her hands about 

 his back, the other (left) about his shoulders with the fingers 

 passing under his left arm. The baby sits breast to breast with 

 the mother, his right hand on her left shoulder, his left grasping 

 the hair of her right side. His hind feet grasp the hair just 

 above her hips. He nurses from the left breast. This seems 

 to be the typical position for both in resting and sleeping. 



When moving about Dolly carries him suspended under her 

 breast, with one hand, usually the right, grasping his neck and 

 holding him against her. Her other hand is used in walking 

 and feeding. The baby grasps the hair of her sides with all 

 four paws, his legs straight and extended up along her sides 

 as far as they will reach. His eyes are closed and his face pressed 

 tightly against her breast. He looses hold with his hind feet. 

 Dolly stops and presses tightly against his neck. He kicks 

 about and finally regains his hold. 



Dolly objects to the presence of observers, watches us, and 

 finally starts to go inside through the chute. At the passage 

 she hesitates as though to make sure that her own body and 

 that of the baby will go in. She holds him very tightly on 

 entering. 



6.00 P. M. Found them seated on the shelf in the usual posi- 

 tion. Dolly catches the baby by the fore -lock and stretches the 

 skin of his forehead tightly back, gazing intently at his face. 

 She then fingers his eyes, nose and mouth. She grasps his right 



1 The shelf is six feet from the ground and is eight feet long by ten inches wide. 

 Ascent is made by a long, narrow, inclined plane. 



