248 Studies in Animal Behavior 



did not make more than a rather playful pretense 

 of biting one's hand. Of affection or attachment to 

 any one, such as has been described in other kinds 

 of monkeys, Lizzie showed scarcely a trace. She 

 seemed to enjoy the presence of people much as 

 she would be gratified in examining a new kind of 

 object; the pleasure she derived was an intellectual 

 one rather than an emotional satisfaction such as 

 a dog takes in his master. When she was irritated, 

 which was easily done, she would give a sort of 

 bark and face one with an open mouth and gene;-al 

 attitude of attack. Fits of temper wore off very 

 quickly, for she was very changeable in her moods 

 as well as in her mental pursuits. She was also 

 quickly over her fears. With her, sufficient not only 

 for the day but for the moment was the evil thereof. 

 She wasted no time in retrospection; she lived en- 

 tirely in the present, and in one of very narrow span. 

 While Lizzie was a most admirably efficient little 

 mechanism for getting on in life under the con- 

 ditions of a tropical forest, she proved to be quite 

 stupid when tested according to certain other stand- 

 ards. In order to get a clearer insight into her 

 mentality, recourse was had to a number of experi- 

 mental tests. The front of Lizzie's cage was made 

 of vertical bars which were far enough apart to 

 allow her to reach out her arm between them. A 

 board was placed just outside her cage and a piece 

 of apple put on the board beyond her reach. Lizzie 

 grabbed at the apple, pushing the board to one sidPr 



