In their walks they were often accompanied by one or both of Ulama's pumas, and on the day referred to the male one, 'Tuo,' as it was called, came after them when they had gone a little way, and trotted quietly beside them; and this, as it turned out, saved their lives. They came upon a place they had not seen before. Two great iron gates of highly finished workmanship, and picked out with gold, shut in a narrow opening in a high rock. They were such as might form the entrance to a public garden. A broad road wound round from the inside of the gates; but outside, where Templemore and Elwood were, the rocks rose up fifty or sixty feet, or even more, on either side; and though they followed them a considerable distance on both sides of the gates, the rocks still towered up precipitously for as far as they could see. "This can scarcely be the entrance to Coryon's 'domain,'" said Jack, "or there would be some people about on guard. It must be some kind of public place." "A cemetery, perhaps," suggested Leonard. "I believe you've hit it. Well, there's a gate open, so I suppose there's no harm in our having a peep inside." "Suppose some one were on the watch, and were to pop round and close and lock the gates when we were inside and out of sight," said Leonard suspiciously. "Monella warned us to be wary and to suspect traps." "We have our revolvers; and, if the worse came to the worst, we could climb over these rocks." In the result they went inside; then made their way to a wide terrace that ran round an extensive area of horseshoe shape, half natural, half artificial, as they judged. This terrace extended several hundreds of yards in both directions from the point at which they stood; but it narrowed off considerably on one side of the horseshoe. Above and behind it, cut out of the rock, were other terraces, like steps or rows of seats, but broad below and narrowing as they got higher. These went all round, almost to the top of the rocks. It was, in fact, a vast amphitheatre where many thousands of people could stand or sit. At the farther end it was open; and in the centre was a large arena sunk some fifteen feet below the main terrace on which they stood. This arena opened out into a deep defile beyond, from the rocky heights of which there issued a rushing stream of water that flowed into a large, dark-looking pool below.