He looked to discover the whereabouts of Costal and the negro; but for some time he could see nothing of either. The enchanted hill, glistening with a vitreous translucence under the white moonbeams, presented a wild, weird aspect; and, from time to time, strange unearthly sounds appeared to proceed from it, as also from the woods around.

The nerves of the ex-student were at no time of the strongest; and he had not long occupied his elevated post before he began to rue his rashness, in having trusted himself alone in a place which seemed to be the abode of the supernatural.

All at once a sound reached him, proceeding from the margin of the lake; and, turning his eyes in that direction, he beheld the figure of a naked man moving among the reeds. It was the same apparition that had caused such alarm among the domestics of Don Mariano, who, although unseen by the Captain, were at that moment only fifty paces distant, screened behind the bushes that grew around the glade in which they had encamped.

The apparition, although it at first startled Don Cornelio, did not frighten him so much as it had the domestics; for, by the light of the moon, he was enabled to recognise the figure as that of his attendant, Costal. The Captain, moreover, saw—what, from their position, was invisible to the people in Don Mariano’s camp—another human figure, naked like the first, but differing from it in the colour of the skin, which was black as ebony.

Both having passed through the reeds, plunged at once into the open water of the lake; and, swimming off towards the enchanted mountain, were soon lost to the eyes of Don Cornelio, as well as to those of the affrighted attendants of Don Mariano.

While the latter remained under the full conviction that they had seen the Indian who, for five hundred years, had been vainly searching for his heart, Don Cornelio knew that the two adventurers were his own followers, Costal and Clara.

From the direction they had taken through the water, he divined that it was their object to reach the mountain island, there, no doubt, to practise their superstitious ceremonial.

Although somewhat disappointed at being deprived of a spectacle he had felt curious to witness, he still remained on his perch upon the tree. His apprehension of being pursued by the bandits of Arroyo had not yet forsaken him; and in such a contingency, he believed that he would be safer among the branches than upon the ground. He could watch for Costal and Clara coming back through the water, and then rejoin them as they returned to take possession of their horses, which were still visible to him upon his elevated post.

For a short time he remained in his position without hearing any noise in particular, or seeing anything calculated to alarm him. Then a sound reached his ears that came from a direction opposite to that in which lay the lake. It was a booming sound, like the report of a cannon—shortly after followed by another and another of precisely similar intonation.

Don Cornelio had no suspicion that at that very moment the hacienda of San Carlos was being attacked by the garrison of Del Valle, and that the noise he heard was the report of the howitzer battering in the gates of the building.