In addition to the fact that the other craft carried no lights, she had risked collision with the River Swallow by cutting right across her bows. Both these actions were gross violations of the river law. The two boys stared into the darkness ahead as the gray shadow slipped on toward the Canadian shore.

“Well, I’ll be jiggered!” burst from Harry Ware’s lips. “It’s the ghost craft again.”

“Ghost nothing! If we’d hit her we’d have found her solid enough, I’ll bet,” declared Ralph. “Clap the search-light on her, Hardware. We’ve seen that craft so often lately that the thing is getting on my nerves. Men who are out on lawful errands don’t sneak about without lights. Let’s show her up and see what sort of a boat she is, and who mans her.”

Harry obediently turned his attention once more to the search-light. But though he swung it assiduously in the direction in which the “ghost craft,” as he called the mysterious gray motor boat, had last been seen, its rays failed to reveal a sign of her.

“Well, she can appear and vanish in a mighty spook-like fashion, even though she may be built of solid wood and iron,” declared young Ware, with conviction, as he reported no trace of the craft that had glided across their course in the darkness of the night.

CHAPTER IV.
ON THE TRAIL OF THE GHOST CRAFT.

The boys, whom we left so sadly puzzled by the strange appearance and almost simultaneous vanishment of the “ghost craft” at the conclusion of the last chapter, formed part of a group of healthy, high-spirited lads who are already familiar to most of our readers under the name of the Border Boys. They earned this title in the first place by their feats on the troublous Mexican frontier, where, as related in “The Border Boys on the Trail,” they defeated the machinations of a notorious cattle rustler named Ramon De Barrios, who had long proved a thorn in the side of the ranchers along the frontier.

Particularly had De Barrios harassed the cattle and horses of Mr. Merrill, whose son Jack, a school-fellow of the others at Stonefell College, had invited Ralph Stetson, son of the railroad “king,” and Professor Wintergreen, to spend some time with him and “rough it.” In this volume the secret of the lone mission was revealed, and the boys, by pluck and brain, regained the stolen herd of stock rustled under cover of night from the Merrill ranch by De Barrios and his followers. A thrilling experience was that of the attempted dynamiting of a big irrigation dam in the midst of a violent storm, which had raised the prisoned waters almost to the breaking point. Jack Merrill and his chums succeeded in thwarting the plans of the rascals who hoped to inundate half a county and ruin much valuable property, out of revenge.

In the second volume of this series, “The Border Boys Across the Frontier,” we made the acquaintance of Buck Bradley, a bluff and hearty circus manager who proved to be a trusty ally of the boys when they made their escape from a band of Mexican revolutionists. The boys’ capture had followed their attempt to prevent a large consignment of arms and ammunition from being shipped from Uncle Sam’s side of the line. Once more they proved their right to the title of “Border Boys,” for, by a subterranean river flowing under a supposedly “haunted” mesa, they crossed the international boundary, and at once plunged into a series of strange and exciting adventures, including a ride on a big locomotive that ran the gauntlet of armed rebels.

The boys were next met, together with other old friends, in a succeeding book, which was called “The Border Boys with the Texas Rangers.” Again, amid new scenes, the lads found themselves in exciting predicaments. Jack was lost in a hidden valley from which he escaped by a climb up steep and rocky cliffs, triumphing over apparently insurmountable obstacles. But his pluck and sturdy training brought him successfully through this adventure, and he rejoined his comrades in time to participate in the heading off of a wild stampede of cattle, an opportunity which tested the boys’ best efforts.