By sunset the first day of their search they found themselves in a wild canyon through which the river flowed swiftly. Camp was made at a spot near which a clear spring of water gushed from a wall of the place. It was slightly alkaline, but they did not mind that, as it was preferable even as it was to the muddy, discolored waters of the Rio Grande. The ponies were picketed, a fire was lighted, supper cooked and things put in order for the night.

It was not a cheerful party that gathered about the camp fire. All of them were pretty well exhausted and disheartened by their absolute failure to find any trace of Jack. Captain Atkinson alone would not admit discouragement. He did all he could to keep up the flagging spirits of the two lads, and after supper had been despatched he inquired if they would care to hear some of his experiences on the Border.

“Gladly,” declared Ralph, relieved to hear something that might, for a time at least, take his mind off the possible predicament of his chum.

Captain Atkinson paused to cram his old black pipe with strong tobacco, light it with a glowing coal, and then plunged into his story. As he talked the murmuring voice of the river and the sighing of the night wind in the scanty trees of the canyon formed a fitting accompaniment to his narrative.

“Some years ago,” he began, “I was foreman of a small ranch in the neighborhood of Las Animos, in the eastern part of the state. It was at a time when cattle and horse thieves, ‘rustlers’ as we call them, had been particularly active. Hardly a rancher in the vicinity but had suffered from their depredations, and feeling ran pretty high against them, I can tell you.

“Well, our ranch, which was known as the Flying U, had managed somehow to escape unscathed, although all round us the rustlers had been operating boldly and openly. Their method was to raid a ranch, drive the cattle or horses across the Border and then sell them to Mexican dealers, who drove them to the coast and there disposed of them as best they could. Many were shipped to European ports, so I heard.

But it was impossible that our ranch should long remain untouched in the midst of the general robberies and rascality going on. Although we guarded against it in every possible way, one night our ‘Far Pasture’ as it was called, was raided and a fine bunch of young steers carried off. It was known that the leader of the band was a man named Alvarez; but beyond this fact and the further one that he had been a leader in several of the frequent revolutions in his country, we knew little about him. He was, however, without doubt the most successful and daring rustler that the Border was ever harassed with.

“In fact, so bold was he, and so impossible of capture did he appear, that some of the more superstitious men in the district began to hint that he was of supernatural origin. Those were wild, uncultured days, and the belief began to spread. Every fresh raid added strength to the rumor, until at the time of the robbery of the Flying U I was unable to persuade anyone to accompany me in pursuit of Alvarez; for I was determined to take after the rascal even if the chase led me across the Border.