The boys devoted several minutes to the contemplation of the photograph which the Doctor showed them. Frank remarked that the lightness of the wheels of the chariot would seem to indicate that it was made of metal, and consequently the ancient Cambodians must have been familiar with the use of iron or brass, perhaps both. The soldiers at the bottom of the picture were marching in a manner that denoted military discipline, but he could not make out the nature of their weapons. Certainly they were not rifles, as fire-arms were unknown in those days, and they did not seem to be spears or bows and arrows. The men were provided with shields, and in this respect their customs resembled those of many people of the present day. The Doctor explained that the ancient Cambodians made use of spears; but the principal weapons they employed were clubs, not altogether unlike those of the South Sea Islanders. Sometimes the club was made straight, and at others it was curved at the end farthest from the hand of its owner. It was wielded with the right hand, and the shield was carried in the left. Fred called attention to the fact that there was an elephant in the picture, and the man on his back was in the act of discharging an arrow from a bow. Therefore they must have employed bowmen, and evidently they were an important part of the service, as they were mounted on elephants. "You are quite right in your conclusions," Doctor Bronson responded; "the bowmen were considered of the highest importance, and their arrows often did great execution. The elephant had a prominent place in all the armies of the East, as you know from history, and the Cambodians were no exception to the rule. No Eastern king would consider his retinue complete without a large number of war-elephants in his stables." "There is a tradition," he continued, "that the king of ancient Cambodia had an army of half a million of men, with a hundred thousand elephants, which he could lead to war at a few days' notice. This is undoubtedly an exaggeration; but he probably had a good supply of these very useful animals, and his army presented a fine appearance when it was called to the field." Frank observed that the men did not wear armor, and, in fact, had very little clothing anyway. He wondered that this was the case, as the king was evidently very rich and powerful, and ought to have had his army equipped and dressed in the best possible style. Fred replied that armor, in a hot country like Cambodia, would be a very inconvenient thing for a soldier, and render him practically useless. Frank had not thought of that, and as soon as his attention was called to it he quite agreed with Fred. "A gentleman who visited the temple of Nagkon Wat," the Doctor remarked, "has given a very good account of the general character of the sculptures on the walls. I refer to Mr. Thomson, and cannot do better than quote a few lines from him. [Illustration: VIEW FROM THE CENTRAL TOWER OF THE TEMPLE.]