INTELLIGENCE OF CEBUS. 
491 
able thing was that, however often he was disappointed in the 
beginning, he never was induced to try turning the handle the 
wrong way ; he always screwed it from right to left. As soon 
as he had accomplished his wish, he unscrewed it again, and 
then screwed it in again the second time rather more easily than 
the first, and so on many times. When he had become by 
practice tolerably perfect in screwing and unscrewing, he gave 
it up and took to some other amusement. One remarkable 
thing is that he should take so much trouble to do that which 
is no material benefit to him. The desire to accomplish a 
chosen task seems a sufficient inducement to lead him to take 
any amount of trouble. This seems a very human feeling, 
such as is not shown, I believe, by any other animal. It is not 
the desire of praise, as he never notices people looking on ; it is 
simply the desire to achieve an object for the sake of achieving 
an object, and he never rests nor allows his attention to be dis® 
tracted until it is done. 
1 6th. When he is angry, and has at hand only those things 
which he wishes to keep, he makes a great show of throwing them 
at people, but always retains a hold. Thus if he has had a play- 
thing a long time and is tired of it, he throws it right at a 
person without the least hesitation ; but if he has a new thing 
which he values, he goes through all the appropriate motions for 
throwing, but only brings the object down with a noise upon 
the ground, taking care not to let go his hold. ' He beats people 
with a long cane he has, and when he cannot reach people he 
strikes it with all his strength upon the ground to show what he 
would do if he had the chance. There is no more comical sight 
than to see him hurriedly climbing his screen in fierce anger, 
taking (not without great difficulty) his long and awkward 
stick up with him in order to be high enough to give a good 
blow to a person. The dog is quite afraid of the stick in the 
monkey’s hands, although he is too petted to be afraid of it in a 
person’s. The monkey is jealous of the dog lying in the arm- 
chair in which he sometimes seats himself with my mother, so he 
pokes the stick at the dog (as the chair is beyond the reach of 
bis chain) and makes him get off. 
18th. He was very angry to-day at a servant girl sweeping 
out his place with a long brush, and he seized the brush every 
time the servant attempted to sweep. My mother then took 
it, and he at once became not only quite good-tempered, but 
assisted her in sweeping, by gathering the rubbish in the cor- 
ners of his place into little heaps with his hands, and putting 
the heaps into the way of the brush. 
20th, To-day he broke his chain , and Hew at a servant 
