eys, but a few of them were made with
Macaques. They seem to be attracted generally by all brilliant colours,
but when reduced to a choice between two, such seems to be their tastes.

[Sidenote: CAN DISTINGUISH NUMBERS]

In my efforts to ascertain their mathematical skill, I would take in
one hand a little platter containing one nut, or one small bit of
something to eat, such as a piece of apple or carrot cut into a small
cube. In the other hand I held a small platter, with two or three such
articles of the same size and colour, and holding them just out of reach
of the monkey and changing them from hand to hand, I observed that the
monkey would try to reach the one containing the greater number. He
readily discerned which platter contained one and which contained two or
three pieces. I was long in doubt whether he distinguished by number or
by quantity, and my belief was that it was by quantity only. I first
determined that he could tell singular from plural, by making the one
piece larger and sometimes of a different shape, and from his choice of
these I quite satisfied my own mind that he could distinguish by number.
[Sidenote: THE TEST WITH MARBLES] I next set out to find how far in
numerals his acquirements reached, and after a great number of
indecisive trials I fell upon this simple plan: I took a little square
wooden box and made a hole in one side just large enough for the monkey
to withdraw his hand with a marble in it. I took three marbles of the
same size and colour, and gave them to the monkey to play with. After a
time I put the marbles in a box and allowed him to take them out, which
he could do by taking out only one at a time. I repeated this several
times, so as to impress his mind with the number of marbles in the box.
I then concealed one of the marbles and returned two to the box. On
taking them out, he evidently missed the absent one, felt in the box,
arose, and looked around where he had been sitting. Then he would put
his hand into the box again and look at me; but failing to find it, he
became reconciled, and began to play with the two. When he had become
content with the two, I abstracted one of them, and when he failed to
find it he began to search for it, and seemed quite unwilling to proceed
without it. He would put the one back into the box and take it out
again, as if in hope that it might find the other. I helped him to look
for the missing marbles, and, of course, soon found them. When h