He had reason to suspect some sinister motive. He knew something of both the men—of their public character—he could not otherwise, as they were lords paramount of the place. But of their private character, too, he had some knowledge, and that was far from being to their credit. With regard to Roblado, the cibolero had particular reasons for disliking him—very particular reasons; and but that the former was still ignorant of a certain fact, he had quite as good a reason for reciprocating the dislike. Up to this moment Roblado knew nothing of the cibolero, who for the most part of his time was absent from the valley. Perhaps the officer had never encountered him before, or at all events had never changed words with him. Carlos knew him better; and long ere this encounter, for reasons already hinted at, had regarded him with dislike.

This feeling was not lessened by the conduct of the officer on the present occasion. On the contrary, the haughty jeering tones fell bitterly upon the ear of the cibolero. He replied, at length, “Captain Roblado, I have said it is not worth my while to perform what a muchachito of ten years old would hardly deem a feat. I would not wrench my horse’s mouth for such a pitiful exhibition as running him up on the edge of that harmless gutter; but if—”

“Well, if what?” eagerly inquired Roblado, taking advantage of the pause, and half suspecting Carlos’ design.

“If you feel disposed to risk a doubloon—I am but a poor hunter, and cannot place more—I shall attempt what a muchachito of ten years would consider a feat perhaps.”

“And what may that be, Señor Cibolero?” asked the officer, sneeringly.

“I will check my horse at full gallop on the brow of yonder cliff!”

“Within two lengths from the brow?”

“Within two lengths—less—the same distance that is traced here on the banks of the zequia!”

The surprise created by this announcement held the bystanders for some moments in silence. It was a proposal of such wild and reckless daring that it was difficult to believe that the maker of it was in earnest. Even the two officers were for a moment staggered by it, and inclined to fancy the cibolero was not serious but mocking them.

The cliff to which Carlos had pointed was part of the bluff that hemmed in the valley. It was a sort of promontory, however, that jutted out from the general line, so as to be a conspicuous object from the plain below. Its brow was of equal height with the rest of the precipice, of which it was a part—a sort of buttress—and the grassy turf that appeared along its edge was but the continuation of the upper plateau. Its front to the valley was vertical, without terrace or ledge, although horizontal seams traversing its face showed a stratification of lime and sandstone alternating with each other. From the sward upon the valley to the brow above the height was one thousand feet sheer. To gaze up to it was a trial to delicate nerves—to look down put the stoutest to the proof.