He would walk erect slowly, first on one foot and then on the other, and would put his long arms over his head to balance his body, as it swayed first on one side and then on the other as his pace increased; then he began to run, and at last, grasping a bough, would swing himself forwards first with one hand and then with the other, getting over twenty to thirty paces with the greatest ease and regularity. He was timid, very reluctant to oppose those who teased him, and usually retreated at once. His master used to brush his skin for him when he was out of sorts, and the sensation appears to have been most pleasurable, and he evidently enjoyed the gentle friction very much. Falling ill he had a dose of calomel and a warm bath, the latter remedy being much more to his taste than the other. The skull in the Hoolook has less breadth across the orbits than in the Lar; and in that of a young one the sutures or joinings of the skull-bones are distinct, showing that the side-bones (parietal) of the head unite with the front (frontals), the temporal or ear-bones, and with a part of a wing-shaped bone which forms part of the base of the skull (sphenoid bone). The angle of the jaw projects backwards, and it is slightly turned in; moreover, the projections or cusps of the lower back teeth are five in number, and are prominent-looking and very sharp, as if they could crush a beetle as well as crack a nut. THE WOOYEN APE, OR YUEN.[23] A number of Apes were found in company on a small island near Camboja, and at first sight they appeared to be of different kinds, although they all had the long arms and the general appearance of the “Long-armed Apes” (_Hylobates_). But a careful examination proved that they belonged to one particular species, the individuals of which differ greatly in their colour during different parts of their lives. The young were uniformly dirty white in colour, and had no black spots on their chests or heads. The females were white, with the fur of the back brownish-white, slightly waved, and there was a large black spot on the crown and one on the chest. On the other hand the male was black, and the back of the head, body, and legs greyish. The hands were white. This variation in colour at different ages and in different sexes in one kind should teach us that something more than mere outside distinctions is requisite for deciding the value of what are called species. The dark cap-like mass of hair on the head gives the name to this Ape. Evidently the animal is a puzzle and a source of the marvellous to the Chinese, for one of their gazetteers gives a mixture of correct information regarding its natural history, and of what has been drawn from a very vigorous imagination. [Illustration: HOOLOOK. (_From a stuffed specimen in the British Museum._)]