“But there must be pools and marshes,” said Wilton.

“Pools sometimes, but where you do find one it’s as salt as the sea, only a deal nastier, and if you drink any of it you find it makes you ill.”

“You’ve had that experience?” said the doctor.

“More’n once, sir,” replied Griggs, “and it aren’t nice. Which way do you mean to go to-day, sir?”

“Straight for the mountains,” replied the doctor.

“Humph!” grunted Griggs. “Won’t get there in one journey.”

“No,” replied the doctor, scanning the beautiful elevation through his glass, “but I think we might do what we can in the way of selecting another camp to which we can move a day or two later.”

“Yes, we can do that, sir. But what about here?”

“I should set up the tent here before we start,” suggested Wilton.

“What for, sir?” asked Griggs sharply.