THE DEVELOPMENT OF A YOUNG MONKEY 131 



leaps and bold springs were taken. The mother came down 

 quite often for food without him and often ran back carrying 

 food but leaving young one behind. On the 21st he attempted 

 to carry up his own food, a large piece of bread, in his paws. 

 Dropped it when he started to climb. Went back for it and 

 carried it up in mouth. Slides down the inclined plane as the 

 fireman his pole. If he drops food from shelf or if mother drops 

 food when he is without he runs down and takes it up. Now 

 has a favorite place for eating, a beam resting about half way 

 between ground and the shelf. Mother is now fairly independent. 

 She knocks him around much as she would a smaller adult. 

 Young one still nurses. As a rule she still carries him down. 

 The protective instinct is still strong. Any noise or threatening 

 movement will make her grasp him as of old. 



The canine teeth are now well out. The molars are beginning 

 to appear. Eating is evidently somewhat painful. He can eat 

 only the softest food still. Peanuts, grain, sunflower seed, etc., 

 are hardly touched. Milk soaked bread, soft baker's bread, 

 bananas and grapes are all eaten with relish. He attacks the 

 sweet potato and the carrot but makes no headway. Within 

 the last fortnight control of hands is greatly improved, picking 

 up tiny bits of food from between cracks, and small bits of 

 banana from the wires. On the 22nd he peered underneath 

 side of cage and caught sight of a brass padlock lying at my 

 feet. Reached arm underneath and tried to pull lock forward. 

 Mother immediately came up and peered through crack, drove 

 young one away and tried on her part to draw lock forward. 

 This type of imitation is evidently common in these animals. 



From this period up to December 16th there has been very 

 little to record. Due to the onset of cold weather all of the 

 monkeys were again placed together. This made conditions 

 rather unnatural because of Jimmie's continued cruelty. After 

 a few days he had to be removed. The mother carries the baby 

 constantly while in the enclosure with the other monkeys. The 

 young one in his turn seems in constant fear of his life, rarely 

 even attempting to get away from his mother. There are two 

 more steps in the development which we would like to obtain — 

 the age at which the mother entirely weans the young and the 

 age at which sexual maturity is reached. Since under the 

 present living arrangements of the monkeys these two obser- 



