Another small specimen which I saw at Gaboon was not of much interest except from one fact, and that was it was broken out with an eruptive disease prevalent among the natives. This disease is called _craw-craw_, or _kra-kra_. It is said to originate from the water, either by external or internal use of that fluid. This animal was infected in the same way and on the same parts of the body as men are affected by the same disease, and is another instance of apes being subject to the same maladies as those of man. The specimen itself also exemplified the difference in intellect among these animals, for this one had in its face a look of mental weakness, and every act confirmed the fact. It was silent, inactive, and obtuse. During my residence in the cage I saw fewer chimpanzees than gorillas; but from those I did see it was an easy matter to determine that they are much less shy and timid than the gorillas. On one occasion I heard a chimpanzee in the bush not far away from the cage. I called him with the usual sound. He answered, but did not come to the cage. It is probable that he could see it and was afraid of it. I tried to induce Moses to call him, and he did once utter the sound; but he appeared to regret having made the attempt. I called again and the stranger answered, and from the manner in which Moses behaved it was evident that the call had been understood. Moses would not attempt the call again, but clung to my neck with his face buried under my chin. It was probably jealousy that caused him to refuse, because he did not want the other to share my attentions. I gave the food sound, but I could not induce the visitor to come nearer. I failed to get a view of him so as to tell how large he was, but from his voice I judged that he must have been about full-grown. Whether he was quite alone or not I was not able to tell; but only the one voice could be heard. Another time while I was sitting quite alone, a young chimpanzee, perhaps five or six years old, appeared at the edge of a small opening of the bush. He plucked a bud or leaf from a small plant. He raised it to his nose and smelt it. He picked three or four buds of different kinds, one or two of which he put in his mouth. He turned aside the dead leaves that were lying on the ground, as if he expected to find something under them. I spoke to him, using the call sound; he instantly turned his eyes towards me, but made no reply. I uttered the food sound, and he replied but did not move. He betrayed no sign of fear and but little of surprise. He surveyed the cage and myself. I repeated the sound two or three times. He refused to approach any nearer. He turned his head from side to side for a moment, as if in doubt which way to go; then he turned aside and disappeared in the bush. He did not run or start away as if in great fear, but by the sound of the shaking bushes it could be told that he increased his speed after he had once disappeared from view.