They made a good distance that day, and went into camp that night near the foot of some low hills.
"It will be cooler traveling tomorrow," said Tom. "We will be up higher, and though we'll have to go slower on account of the up grade, it will be better for all of us."
They found the trail quite difficult the next day, as there were several big hills to climb. It was toward evening, and they were looking for a good place to camp for the night, when Delazes, who was riding in the first cart, was observed to jump down and hasten to the rear."
"I wonder what he wants?" spoke Tom, as he noted the approaching figure.
"Probably he's going to suggest that we take a few days' vacation," ventured Ned. "He doesn't like work."
"Senor," began Delazes addressing Tom, who called to Eradicate to bring his oxen to a halt, "are you aware that we are being followed?"
"Followed? What do you mean?" cried the young inventor, looking quickly around.
"Bless my watch chain!" gasped Mr. Damon. "Followed? By whom?" He, too, looked around, as did Ned, but the path behind them was deserted.
"When last we doubled on our own trail, to make the ascent of the big hill a little easier,"
