Naturalists have ransacked nearly every part of the globe for interesting animals, and have procured them from very out-of-the-way places. One of these localities was particularly difficult to get at years ago, for it is in the hills, far away to the north-east of Calcutta the other side of the great river Brahmapootra, in Assam. Amongst the Garrow and Cossyah hills, where there are wild gorges, and uplands crowded with vast forests, overlooking the wide plains of the river-valley, there were many wonderfully active Gibbons. About two feet in length, they were capable of swinging with unerring certainty from branch to branch, many feet apart; and even the females performed these constant and natural movements while their young were hanging to them. They were black in colour, with white eyebrows, or, rather, a white band across the forehead. When caught, they soon became tamed, especially when young, and were docile and affectionate. One which was kept by Dr. Burrough was two feet six inches in length, yet the fore-limb was only five inches shorter than this, the length of the hand itself being six inches. [Illustration: SKULL OF HOOLOOK.] So great was the disproportion of the legs and arms, that the first were, including the feet, only nineteen inches long, and the fingers touched the ground readily when he was standing erect. This Hoolook was of a deep black colour, and he had the usual simple band of white across the forehead, and black hands and feet. He was caught in the usual haunt of this species, not on the upper, but on the lower hills, which do not reach a greater altitude than 500 feet, and being well treated, he was easily tamed, and his habits were capable of being well watched. He liked the fruit of the peepul-tree better than anything, and bananas; but he took to rice and milk, and enjoyed snapping up a sweet or two, and especially delighted in Spiders. Meat he cared little about, and pork and beef he detested, but he liked fish occasionally. After about a month’s captivity he took a great fancy to his master, and would come to his call, and sit up to breakfast. He liked to help himself to chicken and egg, and at first was very bad in his manners, dipping his fingers into the coffee and milk, and then sucking them. Afterwards he was taught to hold a cup and to drink from it.