"He thinks we are plotting," hinted Jack, looking after the old man with anything but an amiable expression.

"No. He trusts me too much. Besides, he would not care if he did guess we were plotting, Señor, thinking, as he does, that I know not the secret way."

"And you do know it?"

Cocom looked around and saw nobody. Then he turned towards Jack, and nodded significantly.

"Yes, Señor, I do know it."

"Bueno! And when——?"

"Another time, Don Juan. We have already spoken too long. Let us resume our examination of the sacred city. It is not wise to be incautious. Folly is loud of speech, but Wisdom is silent."

Jack acquiesced in this view of the matter, and they walked on. He was greatly interested in all he saw around him, as it is not given to everyone to view a great aboriginal civilisation in its full glory. But for the horrible fear he had of failing to escape, and thus run the risk of being sacrificed to the war-god, he would have been quite fascinated by this extraordinary place. Always a bit of an archæologist, he viewed with enthusiasm these giant palaces, these massive temples—works of a great race, still as fresh under the blue tropic sky of to-day as when they were first reared in the dim past. When Europe was a land of savages, this city was built; it rose in its splendour while Greece was in her glory and Rome was not. Back, many ages back before Christ; before David, perchance before Abraham, these superb edifices rested majestically in this smiling valley. Still were they inhabited, still were they the home of a race, of a religion—the seat of a barbaric civilisation, the oracle of a faith, as they had been in their pristine glory. The empire of Montezuma had fallen in Mexico, the Incas were now but a name in Peru, gone were the Toltecs, scattered the Mayas, yet the buried city of Totatzine, safe in the midst of primeval forests, endured still, and would endure until that fatal day, which would surely come, when the aboriginal race would silently retreat before the conquering forces of civilisation. Here was the last stronghold of the old gods, driven from the table-lands of Anahuac; here smoked anew those altars overturned by the Conquistadores; here shrieked the victim on the terrible stone of sacrifice; and here was the shrine of the famous Opal, the Chalchuih Tlatonac, the very mention of which thrilled the hearts of all far and wide with superstitious dread.

The sacred city was admirably situated for all purposes. Nothing could be more beautiful than this majestic work of man, set like a jewel within the green circle of the forest-clad mountains. Its health was assured by its being fortunately placed in the genial climate of the Tierra Templada. A vast wall built across the huge rift of the cañon protected it from foes in the west, and the peaks, the impenetrable forests, formed a barrier against the outside world on all other sides. Its inviolability depended upon its remaining hidden in the shadow of the forests; and in this isolated valley none would guess the secret of its existence. It was veritably a buried city, secluded from the prying gaze of mankind, and was probably the only one of its kind in the world. Beautiful, healthy, well defended, closely hidden, this strange town was the pride of the barbaric tribes of Central America—their Mecca, their Jerusalem; the altar of their ancient faith, the city of the shining precious stone. This was the true city of the opal, and not Tlatonac, for here in the central shrine flashed the great gem on the altar of the war-god. The paths of all savage men converged to this place, and from here welled forth the influence of the old gods which frustrated the efforts of the Padres to Christianise the tribes of Central America.

Down the eastern peaks fell a mighty torrent, which swept irresistibly across the flat plain, and emerged from the valley through the cañon on the west. On either side of this stream was the city built, and three bridges of massive stone connected the one town with the other. That on the right bank of the stream was the city of the priests, while to the left lay the city of commerce, of dwellings, of daily life. In the sacerdotal town a large square surrounded the vast mound whereon was built the teocalli of the Chalchuih Tlatonac, and from this square streets radiated—to the stream, to the mountains, to the wall, like the spokes of a vast wheel. A similar square, with radiating streets, formed the plan of the other town, save that the palace of the Cacique occupied the place of the teocalli. Both towns were crowded with Indians, but the sacerdotal portion was principally filled with pilgrims, come to worship at the shrine of the opal, while the settled population lived on the other side of the stream. There were large caravansaries round the teocalli, for the accommodation of the visitors who came from all parts of Central America; and Totatzine derived its wealth, its splendour, its very existence, from the constant crowds pouring in through the secret way to worship the old gods. The entrance to that way was supposed to be in the shrine itself, but none knew the exact place save the priests of Huitzilopochtli, and these jealously preserved the secret on which depended their power.