236 Animal Intelligence 
caused the ¢ casual observer, if he has any psychological in- 
a lighted be struck by the general, aimless, intrinsically 
formec:¢ (to the animal’s feelings) physical activities of a 
he ~ey compared with the specialized, definitely aroused, 
-tilitarian activities of a dog or cat.) Watch ithe latter and 
he does but few things, does them in response to obvious 
sense presentations, does them with practical consequences 
of food, sex-indulgence, preparation for adult battles, etc, 
| Tf nothing that appeals to his special organization comes 
up, he does nothing. \Watch a monkey and you cannot 
enumerate the things he does, cannot discover the stimuli 
to which he reacts, cannot conceive the raison @étre of 
his pursuits. Everything appeals to him. He likes to be 
active for the sake of activity. | 
The observer who has proper opportunities and takes 
proper pains will find this intrinsic interest to hold of men- 
tal activity as well. LNo. 1 happened to hit a projecting 
wire so as to make it vibrate. He repeated this act hun- 
dreds of times in the few days following. He did not, could 
not, eat, make love to, or get preliminary practice for the 
serious battles of life out of, that sound. But it did give 
him mental food, mental exercise. Monkeys seem to enjoy 
strange places; they revel, if I may be permitted an an- 
thropomorphism, in novel objects4 They like to have 
feelings as they do to make movements. The fact of men- 
tal life is to them its own reward. | 
It is beyond question rash for any one to venture hy- 
potheses concerning the brain parallel of mental conditions, 
most of all for the ignoramus in the comparative histology 
of the nervous system, but one cannot help thinking that 
the behavior of the monkeys points to a cerebrum that is no 
longer a conservative machine for making a few well-defined 
sorts of connections between sense-impressions and acts, 
