The next morning he came to the ruins with Indians, ropes, and candles, and we began immediately with one of those on the platform before the Casa del Gobernador. The opening was a circular hole, eighteen inches in diameter. The throat consisted of five layers of stones, a yard deep, to a stratum of solid rock. As it was all dark beneath, before descending, in order to guard against the effects of impure air, we let down a candle, which soon touched bottom. The only way of descending was to tie a rope around the body, and be lowered by the Indians. In this way I was let down, and almost before my head had passed through the hole my feet touched the top of a heap of rubbish, high directly under the hole, and falling off at the sides. Clambering down it, I found myself in a round chamber, so filled with rubbish that I could not stand upright. With a candle in my hand, I crawled all round on my hands and knees. The chamber was in the shape of a dome, and had been coated with plaster, most of which had fallen, and now encumbered the ground. The depth could not be ascertained without clearing out the interior. In groping about I found pieces of broken pottery, and a vase of terra cotta, about one foot in diameter, of good workmanship, and having upon it a coat of enamel, which, though not worn off, had lost some of its brightness. It had three feet, each about an inch high, one of which is broken. In other respects it was entire. The discovery of this vase was encouraging. Not one of these places had ever been explored. Neither Don Simon nor any of the Indians knew anything about them, and, entering them now for the first time, we were excited by the hope that we had discovered a rich mine of curious and interesting fabrics wrought by the inhabitants of this ruined city. Besides this, we had already ascertained one point in regard to which we were doubtful before. This great terrace was not entirely artificial. The substratum was of natural rock, and showed that advantage had been taken of a natural elevation, so far as it went, and by this means some portion of the immense labour of constructing the terrace had been saved. On the same terrace, directly at the foot of the steps, was another opening of the same kind, and, on clearing around, we found near by a circular stone about six inches in thickness, which fitted the hole, and no doubt had served as a cover. This hole was filled up with dirt to within two feet of the mouth, and setting some Indians at work to clear it out, we passed on in search of another.