“I am not so sure that we will try to get the treasure,” he told them. Their faces fell, but they did not argue.

“You see,” he went on, “we aren’t going to be thieves. That treasure is the Incas’ own; it isn’t like buried gold. Of course, the people have taken a white man prisoner, and perhaps if we find it wise to take enough away from them to reimburse us for the expenses, it would not be dishonest.”

“I agree with you,” Cliff declared, “anyway, if we do find my father——” a hope which his chums eagerly echoed, “——he will be able to get all the royalties from his other books, which the publishers have held back, not knowing what to do, and only giving me enough to pay expenses. He will share with us all. My father is that kind of man!”

They were quite satisfied. The adventure would be sufficient as Tom put it.

Eager were their plans. Lists of things to take were made; plentiful discussions ensued, even amounting almost to arguments, for Nicky wanted a full arsenal of weapons, and enough ammunition to load down a mule. But he gave it up, for Cliff, from a study of his father’s notes for part of his book, assured them that the Incas were not very warlike or cruel. They were not like the Mexican Aztecs, who, in days past, had been cruel and harsh. The Incas, he said, were rather gentle, making war only in self defense, or to add territory when it was essential to their growth of empire.

Cliff, from his studies, conceived a great plan. Mr. Whitley agreed that it would be worth trying. What it was, and how it would work out, only time could tell; but it was so well thought of that some special articles were included in their supplies in order that they could use Cliff’s method of entry into the country.

“Of course that means if you boys go beyond Cuzco with us,” John Whitley said, when he had secured parents’ consent to the adventure and had given promises to avoid danger. The chums felt very certain that they would go well beyond Cuzco, old Inca city, once capital of their vast empire.

In time goodbyes were said, final promises made, handkerchiefs waved from a departing train. The day spent in New York was a delight to the chums, and so was the embarkation on the great white fruit liner which would take them southward.

They laughed when, soon after the boat sailed, great clusters of bananas were placed within easy reach of passengers; that was a custom on the liners and it made the tropics seem very real and quite close already. The days of their voyage to the Panama Canal were spent in studying some books of Inca lore, and in working out better systems of signals for the Mystery Boys’ order.

The passage through the Canal, the visit to one of its huge mechanically worked locks, the sights of the strange mingling of East and West in Panama City, added zest to the trip.