“O, I am not joking. Let’s visit Don Carlos. Mark my words now, Frank: that old rascal knows more about the horse-thieves, than any body else in the country. We are on pretty good terms with him, and perhaps he will invite us to stay all night. If he does, we may be able to learn something about the bridge of clouds, and the other strange things old Bob saw there. Will you go?”

“Of course. But I’ll tell you what it is: You are going to be disappointed. We must not let Don Carlos know that we suspect any thing, for if we do, we may get ourselves into trouble.”

“I guess we are smart enough to look out for that. We will listen to his stories, and hear him rail at the robbers, and lament the loss of his fine horses, and all that, and act as though we believed every word of it. We mustn’t let Dick know where we are going,” added Archie. “He would be sure to make a fuss about it, for he has somehow got it into his head that he is our guardian in uncle’s absence.”

One would think that the cousins had already seen enough of excitement and perilous adventure, to satisfy any two boys in the world; and that, after their recent narrow escape from the clutches of Old Davy, they would think twice before undertaking so dangerous an enterprise as this, which Archie had called “bearding the lion in his den.” The way they went about their preparations, however, showed that they were in earnest, and that they were fully determined to learn more about the mysterious rancho, that is, if there was any thing more to be learned. Frank did not think there was. Of course the friendly old Spaniard would insist that they should accept his hospitality for the night, as he always did when they visited him. They had passed two or three nights under his roof, without seeing or hearing any thing unusual, and they would do it again. As for Don Carlos’ complicity with the horse-thieves, that was all in Archie’s eye. It was only another of the thousand-and-one foolish notions he was continually getting into his head, and when morning came he would be obliged to acknowledge the fact. Archie, on the other hand, had made up his mind to see some queer sights during the night, if they remained at Don Carlos’ rancho. He knew that he would have to fight somebody, and he prepared for it by putting a small revolver into his pocket, as did Frank, also. He was satisfied, too, that Bob had seen his horse go into the Spaniard’s rancho; and, if he was still there, Archie would have him out, or he would raise a fuss about the old fellow’s ears that would make him think he had stirred up a hornet’s nest.

“Just think of it!” exclaimed Archie, indignantly. “Our horses are being used every night by those robbers! O, you may smile and shake your head as much as you please, but I know it is so!” Frank thought if his cousin’s convictions on this point were as strong as the blow he struck the table to emphasize his words, they must have been very powerful indeed. “Now, I can tell you in a few words just how this matter stands,” continued Archie, “and one of these days you will see that I am right. The robbers make their head-quarters at that rancho, and ride Roderick and King James on their plundering expeditions. They know that the animals are swift, and that if they are discovered they can run away from their pursuers very easily. But my horse sha’n’t engage in any such business. He is a good honest horse, and I am not going to have him taught any bad habits.”

In a few minutes the boys were in their saddles, and galloping through the grove toward the creek. They carried their rifles slung over their shoulders by broad straps, their navy revolvers in their holsters, and their small pistols in their pockets. They rode the same horses that had carried them through the fight with the grizzly, Archie remarking that although his nag was not much of a jumper, he was a good one to go, and he might have occasion to use a fast horse before morning. They succeeded in leaving the rancho without the trapper’s knowledge; and in half an hour drew rein on the bank of the creek a short distance from Don Carlos’ rancho.

The building was like a good many others in that country—there was nothing remarkable about it, either in its appearance or history. It had stood a siege, and there were plenty of bullet-marks about it; and the same was true of the rancho in which Frank and Archie lived. It was built in the form of a hollow-square; the rough stone walls were five feet thick; and all the openings, except the port-holes, were protected by heavy plank doors and shutters, through which a rifle-ball could not penetrate. A tall flag-staff arose from the open court in the center, and from it floated the Stars and Stripes. Don Carlos was evidently patriotic.

The boys gazed long and earnestly at the building, and Archie was a good deal disappointed because he did not see some signs of the curious things the old trapper had witnessed there. They saw something else, however, at least Frank did, and he called Archie’s attention to it, by inquiring:

“Do you see the second port-hole from the right-hand side of the building?”