The boys got no farther than the plaza, where they sat down on a bench. It was wholly different from any American town. Ken suspected that Hal was getting homesick, for the boy was quiet and inactive.

"I don't like this place," said Hal. "What 'd you ever want to drag me way down here for?"

"Humph! drag you? Say, you pestered the life out of me, and bothered Dad till he was mad, and worried mother sick to let you come on this trip."

Hal hung his head.

"Now, you're not going to show a streak of yellow?" asked Ken. He knew how to stir his brother.

Hal rose to the attack and scornfully repudiated the insinuation. Ken replied that they were in a new country and must not reach conclusions too hastily.

" I liked it back up there at the little village where we saw the green river and the big trees with the gray streamers on them," said Hal.

"Well, I liked that myself," rejoined Ken. "I'd like to go back there and put a boat in the river and come all the way here."

Ken had almost unconsciously expressed the thought that had been forming in his mind. Hal turned slowly and looked at his brother.

"Ken, that 'd be great--that's what we came for!"

"I should say so," replied Ken.

"Well?" asked Hal, simply.

That question annoyed Ken. Had he not come south to go into the jungle? Had he come with any intention of shirking the danger of a wild trip? There was a subtle flattery in Hal's question.

"That Santa Rosa River runs through the jungle," went on Hal. "It flows into the Panuco somewhere. You know we figured out on the map that the Panuco's the only big river in this jungle. That's all we want to know. And, Ken, you know you're a born boatman. Why, look at the rapids we've shot on the Susquehanna. Remember that trip we came down the Juniata? The water was high, too. Ken, you can take a boat down that Santa Rosa!"

"By George! I believe I can," exclaimed Ken, and he thrilled at the thought.

"Ken, let's go. You'll win the prize, and I'll get specimens. Think what we'd have to tell Jim Williams and Dick Leslie when we go West next summer!"

"Oh, Hal, I know--but this idea of a trip seems too wild."

" Maybe it wouldn't be so wild."

In all fairness Ken could not deny this, so he kept silent.

"Ken, listen," went on Hal, and now he was quite cool. "If we'd promised the Governor not to. take a wild trip I wouldn't say another word. But we're absolutely free."

" That's why we ought to be more careful. Dad trusts me."

"He trusts you because he knows you can take care of yourself, and me, too. You're a wonder, Ken. Why, if you once made up your mind, you'd make that Santa Rosa River look like a canal."

Ken began to fear that he would not be proof against the haunting call of that jungle river and the flattering persuasion of his brother and the ever-present ambition to show his uncle what he could do.

"Hal, if I didn't have you with me I'd already have made up my mind to tackle this river."

That appeared to insult Hal.

"All I've got to say is I'd be a help to you --not a drag," he said, with some warmth.

" You're always a help, Hal. I can't say anything against your willingness. But you know your weakness. By George! you made trouble enough for me in Arizona. On a trip such as this you'd drive me crazy."

"Ken, I won't make any rash promises. I don't want to queer myself with you. But I'm all right."

"Look here, Hal; let's wait.