Gibbons have often been observed in a state of captivity. Of the slothful and inanimate siamang there is nothing of much interest to report. The other species are, with few exceptions, phlegmatic, shy, and timid, but hardly ever averse from human society. Within a month Harlan was able to make a hulock so tame that he would hold on with one hand to him, while putting the others on the ground, and so walk about with his keeper. He came to his master’s call, seating himself close to him on a chair, shared his breakfast, and took an egg or chicken-bone off the table so neatly as not to soil the cloth. He was fond of cooked rice, bread soaked in milk, bananas, oranges, coffee, tea, chocolate, milk, etc. Generally he only dipped his fingers in the drinking vessels and licked off the liquid, but he could drink in human fashion. He searched the house for spiders and other creeping things, and brushed away flying insects with his right hand. The creature was very affectionate, and when Harlan came to him in the morning, he greeted him with a joyful sound like a bark, which went on for about a minute. He came to a call even when at a distance, and was pleased to be combed, brushed, and fondled. Two other hulocks taken by Harlan behaved in the same way. The _Hylobates albimanus_ of the Berlin Aquarium, which I have already mentioned, was, as described by Hermes, and also according to my own observations, a very peaceable creature, although, if compelled to do what he did not like, he sometimes tried to bite a little, especially when just taken from his warm bed. But as soon as he was taken by the hand or lifted up, his anger was appeased. Although much less lively than the chimpanzee which was his companion, and less inclined to play, he was pleased with children, and watchfully observed their movements. His dexterity was wonderful. He was almost always present at dinner and supper, when the table was covered with dishes, and he ran up and down it, in order to go from one person to another, without touching, still less upsetting, the smallest article. His food consisted chiefly of white bread, milk, sweet cocoa, fruit, and Kiel sprats, of which he was particularly fond, as well as of sweet grapes. Before taking any liquid, he cautiously touched it with his tongue, to ascertain that it was not too hot; then he drank it up, without taking the cup or vessel in his hand, as the chimpanzee did. He did not like cold or moist food, and would seldom touch a peeled pear, while willing to eat it from Herme’s hand. Grapes were his favourite dainty, and if hungry when he saw them, he uttered a gentle noise which resembled the cry of a wood-pigeon. He often repeated this noise, _Hu_, _Hu_, to express pleasure, surprise, or curiosity, or when the same sound was uttered by others; and it was in this way that he greeted Hermes when he came to his bed in the morning. He was happiest when seated on a woman’s arm, with his long arms wound round her neck, and would sit