As they advanced, the banks rose higher above the surface of the stream, and the channel became the bottom of a deep, narrow ravine, where the water rushed foaming among rocks. The great trees growing on each side stretched towards one another, until their branches interlocked, forming a dark sombre tunnel underneath. At the lower end of this, the stream, once more bursting forth into light, leaped vertically at one bound through a space of two hundred feet sheer, falling into the bottom of a deep gorge, with a noise louder than the roar of the mighty ocean. Just where the foaming flood broke over the crest of the rocks, grew two enormous cypresses of the kind known to the Mexicans as _ahuehuetes_, or "lords of the water." They stood on opposite sides of the stream, with their long arms extended towards each other. Thickly loaded with llianas, and profusely festooned with the silvery Spanish moss, which, drooping downwards, every now and then dipped into the foaming arch of the cascade, these two great trees looked like the ancient genii of the waters. At this point the two men made a halt. Although they were now very near to the place where the jaguars were supposed to be, Clara had become more regardless of the danger. His fear, both of wild beasts and evil spirits, had yielded to his thirst for gold, which had been gradually growing stronger. "Now, Clara!" said Costal, turning a severe look upon his comrade; "listen attentively to the instructions I am about to give you. If the Siren should appear to you, and you should exhibit, either by look or gesture, the slightest symptoms of fear, you are a lost man!" "All right!" replied the negro. "The hope of being shown a mine of gold gives me courage to risk even my neck in a halter, if need be. Never fear, Costal. Speak on--I am ready to listen." As the negro pronounced these words, his countenance to all appearance expressed as much firmness as that of Costal himself. The Indian, thus assured, seated himself upon the very edge of the precipice, overlooking the gorge into which the waters were precipitated, while Clara, without invitation, sat down by his side. CHAPTER TEN. STRAYED FROM THE TRACK. The ravine, below the spot where the Indian and negro had seated themselves, was covered with a luxuriant vegetation--plants and trees of tropical growth so thickly standing over the ground that the rays of the sun could not have penetrated through the umbrageous foliage. Notwithstanding this abundance of vegetation, if the two gold-seekers had not been so absorbed in their designs, they might have seen below them the figure of a man, who was standing at the bottom of the cascade, directly under their feet. This man, who had just arrived on the spot, and who appeared to be regarding the waterfall with looks of curiosity and admiration, was no other than Rafael Tres-Villas, Captain of the Queen's Dragoons.