A male chimpanzee, which was kept in the Berlin Aquarium in 1876, was remarkable for his excessive liveliness. He had contracted a friendship with a fellow-captive, a young female orang, and their intimacy was confirmed by their games together, accompanied by many tender embraces. The small orang, a good-tempered, phlegmatic creature, allowed the chimpanzee to do what he pleased with her, and the former betrayed remarkable intelligence. In consequence of a general repair of his cage, Dr. Hermes, the director of the institution, to whom we owe this account, was obliged to keep the chimpanzee in his office, in company with himself and other officials. The chimpanzee soon accustomed himself to his new surroundings, and was on particularly friendly terms with Dr. Hermes’ two-year-old boy. When the child entered the room, the chimpanzee ran to meet him, embraced and kissed him, seized his hand and drew him to the sofa, that they might play together. The child was often rough with his playfellow, pulling him by the mouth, pinching his ears, or lying on him, yet the chimpanzee was never known to lose his temper. He behaved very differently to boys between six and ten years old. When a number of schoolboys visited the office, he ran towards them, went from one to the other, shook one of them, bit the leg of another, seized the jacket of a third with the right hand, jumped up, and with the left gave him a sound box on the ear; in short, he played the wildest pranks. It seemed as if he were infected with the joyous excitement of youth, which induced him to riot with the troop of schoolboys. One day when Hermes gave his nine-year-old son a slight tap on the head, on account of some miscalculation in his arithmetic, the chimpanzee, who was also sitting at the table, gave the boy a smart box on the ear. If Hermes pointed out to him that some one was staring or mocking at him, and said, “Do not put up with it,” the creature cried, “Oh! oh!” and rushed at the person in question in order to strike or bite him, or express his displeasure in some other way. As he made distinctions in the age of human beings, so also with animals. He was gentle and considerate in his behaviour to young dogs and apes, while with older animals he was as boisterous as he was with the schoolboys. When he saw that Hermes was writing, he often seized a pen, dipped it in the inkstand, and scrawled upon the paper. He displayed a special talent for cleaning the window-panes of the aquarium. It was amusing to see him squeezing up the cloth, moistening the pane with his lips, and then rubbing it hard, passing quickly from one place to another.