erest in that over which he had worked so persistently. No man
could have devoted himself more earnestly to learn some new art, and
become more indifferent to it when once learned. These are a few only of
the many acts of intelligence observed by Mr. Romanes in the doings of
this animal. They will suffice as examples of what we mean by
spontaneous intelligence. The cebus did not need to be shown how to do
things; it worked them out for itself much as a man would have done,
performing acts of an intricacy far beyond any ever observed in other
classes of animals in captivity. It may be said further that the
displays of spontaneous intelligence shown by dogs, cats, and similar
animals have usually been intended in some way for the advantage of the
animal; few or none are on record which indicate a mere desire to know
without ulterior advantage; no persevering effort, like that with the
brush, which is purely an instance of self-instruction.

Examples of intelligence of this advanced character could be cited from
observation of monkeys of various species. The anthropoid apes have not
been brought to any large extent under observation, but are notable for
their intelligence in captivity. It is not easy to observe them in a
state of nature, and nearly all we know is that the orang makes itself
a nightly bed of branches broken off and carefully laid together, and is
said to cover itself in bed with large leaves, if the weather is wet.
The chimpanzee has a similar habit, and the gorilla is said to build
itself a nest in which the female and the young sleep, the old male
resting at the foot of the tree, on guard against their dangerous foe,
the leopard.

It is the young animals of these species which are the most social and
docile and most approach man in appearance. As they grow older, their
specific characters become more marked. Fierce and sullen as is the old
gorilla, the young of this species is playful and affectionate in
captivity and is given to mischievous tricks. The one that was kept for
a time in Berlin showed much good-nature, playfulness, and intelligence,
and some degree of monkey mischievousness. It was very cunning in
carrying out its plans, particularly in stealing sugar, of which it was
very fond.

The chief examples of anthropoid intelligence are told of the
chimpanzee, which has been most frequently kept in captivity. It is
usually lively and good-tempered and is very teachable. Some of the
stories of its