In one test I used a board about two feet long, upon which were a few pieces of white and pink candies, mixed and arranged in four different places on the board. The monkey selected the white from each pile before taking the pink, except in one instance, in which the pink was taken first. In another experiment I took a white paper ball in one hand and a pink one in the other and held my hands out to the monkey. He selected the white one almost every time, although from time to time I changed hands with the balls. It was not a mere matter of convenience with the monkey, for he would sometimes reach over the hand containing the pink ball in order to obtain the white one. Most of these experiments were performed with the Capuchins, but some of them were made with the Rhesus. The fact that monkeys generally seem to be attracted by brilliant colors is doubtless due to the readiness with which these catch the attention; but when reduced to a choice between two colors, they do not seem to give preference to brilliant ones. A unique but simple experiment was made in order to ascertain whether or not monkeys enumerate. I placed on a small platter one nut and a small piece of apple or carrot cut in the shape of a cube. On another platter were placed two or three such articles of like color and size. Holding the two just out of reach of the monkey, and changing hands from time to time, I observed that he tried to reach the platter containing the greater number, thus indicating that he discerned which contained the greater quantity or number of articles. It was long a matter of doubt as to whether it was by number or by quantity that his choice was controlled. But by taking one piece larger than the others and of different shape, it was ascertained that he appreciated the difference of quantity. Then, by taking a platter containing one piece and another platter containing several similar pieces, it was seen that he could distinguish singular from plural. [Illustration: Monkey Learning to Count]