About the premises there were natives all the time passing to and fro, and these two little captives were objects of special interest to them. They would stand by the cage hour after hour and watch them. The ruling impulse of nearly all natives appears to be cruelty, and they cannot resist the temptation to tease and torture anything that is not able to retaliate. They were so persistent in poking sticks at my chimpanzees that I had to keep a boy on watch all the time to prevent it; but the boy could not be trusted, so I had to watch _him_. In the rear of the room that I occupied was a window through which, from time to time, I watched the boy and the natives, and when anything went wrong I would call out to the boy. Aaron soon observed this and found that he could get my attention himself by calling out when any one annoyed him, and he also knew that the boy was put there as a protector. Whenever any of the natives came about the cage he would call for me in his peculiar manner, which I well understood and promptly responded to. The boy also knew what the call meant and would rush to the rescue. If I were away from the house and the boy were aware of the fact, he was apt to be tardy in coming to the relief of the ape, and sometimes he did not come at all. In the latter event the two would crawl into their house and pull down the curtain so that they could not be seen. Here they would remain until the natives had left or some one came to their aid. Neither of the apes ever resented anything the natives did to them, unless they could see me about; but whenever I came in sight they would make battle with their tormentors, and, if liberated from the big cage, they would chase the last one of them out of the yard. Aaron knew perfectly well that they were not allowed to molest him or his companion; and when he knew that he had my support he was ready to carry on the war to a finish. But it was really funny to see how meek and patient he was when left to defend himself alone against the native with a stick, and then to note the change in him when he knew that he was backed up by a friend upon whom he could rely.