“Hurray,” shouted Jack. “Let me go tell them the news.”

And he was off like a shot.

Mr. Temple had proved amenable. His big son, Bob, six feet tall and broad and powerful of frame, was destined eventually to go into the importing firm of which he was president. So, too, was his ward, Frank, son of his former business partner. South American experience, and the knowledge of customs of that part of the world which they would gain on such an expedition as proposed, would be invaluable to both. Under Mr. Hampton’s care, moreover, they would be in good hands. Therefore, although shaking his head laughingly over Mr. Hampton’s boyish enthusiasm, Mr. Temple was glad to acquiesce and to let his boys go.

This was the reason, therefore, that the boys waited curiously for the outcome of that week of conferences between Mr. Hampton and Senor de Avilar, a week during which various strange men came and went. The boys saw little of the older men, and on the few occasions when he did obtain an opportunity to question his father, Jack was put off until a later date, when everything would be explained. Meanwhile, Mr. Hampton said, he was studying maps, talking with guides from the district into which the expedition would penetrate and had his head filled with plans.

“I haven’t the time to detach myself from this business to give you a connected story, Jack,” said he, on one of the few occasions when he was alone with his son for a brief period. “But contain yourself, and presently everything will be explained.”

Young de Avilar knew of the proposed expedition, too, but he knew no more about it than Jack. He had been absent until recently in attendance at the University of Lima, for, though there is an ancient institution of learning at Santiago, his father was by birth a Peruvian who had attended the University of Lima, and the son followed in his steps.

All four boys, therefore, were naturally eager to learn the outcome of the conferences. While waiting, the three North Americans had their interest strung to concert pitch by treasure legends which Ferdinand told them. He, in turn, was eager to hear what to him were even more marvellous stories of the scientific wonders of their own country. In particular, he was eager to learn about the developments of radio, which he had heard was in general use in the United States but which, as yet, had made few advances in Santiago.

“I’ll tell you what,” said Jack, one day. “Suppose we set up a radio station here at your town home, and another at your country place. The distance is only twenty-five miles. With batteries and a spark coil, we can easily send that distance, certainly in this mountain atmosphere. I’ve got an outfit in my trunk, which I packed along in the belief that it would come in handy in the field on an expedition.”

Ferdinand was enthusiastic, and in a short time the two stations were installed, and the young Chilian was instructed in the mysteries of radio.