The fat boy reluctantly obeyed the command of Tad Butler. After some further trouble, Stacy's pony was properly saddled, but still stubborn and ready for further trouble. The lad got on this time without falling off, and with much laughter and joking, the party started off toward the blue haze in the distance, the dark ridge that marked the Guadalupes.

It was in "The Pony Rider Boys in the Rockies" that our readers first learned how this little private club of youthful horsemen came to be organized. The need of open-air life for the then sickly Walter Perkins was one of the great factors in the organization of this little band of rough-and-ready travelers. Our readers remember the adventures of our young friends in the fastnesses of the Rocky Mountains. These lads speedily fitted themselves into the stirring life of the big game land, and had other yet more startling adventures in which wild animals did not play so strong a part as did wild men. The story of the discovery of Lost Claim, with its accompanying battle with claim-jumpers, was fully told in this first volume.

It was in "The Pony Rider Boys In Texas" that we found the lads learning the first rudiments of the cattle business. The thrilling part that the young men took in the long cattle drive, with its stampedes, the fording of swollen rivers, the games of the cowboys and the tricks of the cattle thieves, is related in that second volume. How the boys improved their shooting and mastered the details of that fascinating sport of handling the lariat are all familiar to our readers.

In "The Pony Rider Boys in Montana" is told the story of the long and exciting ride over the old Custer Trail, famous in the tragic annals of our earlier days of Indian fighting. Here the boys found themselves drawn into the life of the sheep men, on those great ranges where the sheep men must still defend themselves from the prejudices, and sometimes from the extreme violence, of the cattle men. It was in this connection that Tad Butler and his friends discovered leading clues in the great conspiracy of certain cattle men against the prosperity and safety of the sheep men. This state of affairs led finally to an angry battle, at which the boys were present. Then, too, our readers all recall Tad Butler's capture by the Blackfeet Indians, and all that befell him ere he succeeded in escaping to his friends.

The next stage of adventures took our lads somewhat further east, as told in "The Pony Rider Boys in the Ozarks." It was a thrilling, desperate time when the boys, with their ponies stolen, found themselves facing actual starvation in the wilds. Tad Butler's perilous trip for assistance is bound to bring throbs of recollection to every reader of that volume. The imprisonment of the youngsters in a mine, following a big explosion, formed another interesting scene in the narrative brought forth in that fourth volume of the series. It was here that Chunky, as our readers know, displayed the splendid stuff that lurked under his odd exterior and behind his sometimes queer manners. How, in escaping from the mine, the Pony Rider Boys penetrated a mystery that had disquieted the dwellers near the Ozarks for a long time, was one of the most interesting features of the tale.

But such strenuous life proves the mettle of the right kind of young Americans. So, far from being discouraged, or sighing for the comforts of home, we next find our lads in Nevada, as related in "The Pony Rider Boys on the Alkali." Here they left grass behind for the glaring discomforts of the baked desert lands, where severe thirst was one of the least yet most constant perils. Roving from water hole to water hole, finding them all gone dry, nearly drove the youngsters mad. Then, too, the fight with the mad hermit, who seemed a part of the life of that bleak desert, helped to accustom the boys to the strenuous life of daily danger.

As our readers will recall, it was in the next volume, "The Pony Rider Boys in New Mexico," that the author described the events surrounding the first real acquaintance that our lads formed with the little that is left of the savage Indian to-day. It was here, too, that they beheld the fire dance of the Saboba Indians in all its ancient fury. The adventures of the young horsemen at this point became fast and furious. Between prairie fire and fight they had the most exciting time of their lives.

Later, after a rest at home, as described in "The Pony Rider Boys in the Grand Canyon," the boys visited the wonderful region of the Colorado. Here, as our readers will recollect, the lads were cut off from their trail by the falling of great masses of rock during a fierce storm. Apparently the boys were doomed to remain helpless on a narrow shelf of rock; our readers recall how Tad Butler, at the risk of his life, spent hours in the attempt to get them out of their dangerous situation. The mysterious circumstances that followed the boys all the way along on their journey through the great canyon form a most remarkable series of events.

Now, from Arizona, Tad and his friends had journeyed onward and into the Lone Star State. Here they looked forward only to a long, healthful ride, full of pleasures, yet devoid of anything like sensational excitement. Yet one never knows what the day may bring forth, and these young travelers of ours, though they did not suspect it, were on the threshold of the most exciting experiences that had yet befallen them. The blue mountain ridge in the near distance was teeming with the story that was to unfold before them. So far the ride had been lonely. Of late rarely had they come in sight of a building of any sort, for this part of the state was but sparsely settled. To meet a horseman was an event. In fact they had not met one since the early morning. The Pony Riders had no guide with them on this journey, believing that one would not be needed. Nor did they carry a pack train. One additional pony bore all their extra baggage, each mount being loaded with all that he could carry in addition to its rider. For tents they had brought one large enough to accommodate the entire party. This was in sections, carried on the different ponies.

Five o'clock had come and gone. The sun was partly hidden by the ridge of the Guadalupes towards which the Pony Rider Boys were slowly drawing. Ned called up to the professor who was riding at the head.