Ned was making a similar protest to his father, who responded by telling him that he would be tired enough before night.

The words proved to be quite true, for they had a long, long journey through rugged valley, up steep mountain side, down precipitous gulch, and across many a roaring torrent, one of which necessitated the use of knotted-together ropes to ensure that the mules with their loads were not swept away.

For in spite of the descents they were gradually ascending into a higher mountainous region which grew more and more grand, while, notwithstanding the fierce heat of the sun, fatigue seemed non-existent, as the party drank in the strong, invigorating air.

The ideas that had been suggested about this part of the country being island-like, rising out of a vast sea of salt desert, were proved to be correct, for during quite a fortnight’s journeyings here and there they obtained glimpses in the far distance of the glistening plains over which hung the cloud-like haze of heat.

But whenever after scaling some height their approach towards the boundaries of the island was revealed, the doctor called a halt, and after a discussion with Griggs they struck off in a fresh direction through what proved to be a perfect wonderland of mountain gorge and forest, the home of wild animals and birds, every valley and plain furnishing supplies, while the want of water was never once felt.

“Why, we must have pretty well explored this part of the country,” said Wilton, one evening, as they sat resting and watching the sun-glow dying out amongst the peaks.

“A little bit of it, sir,” said Griggs dryly; “just to show us how we might spend a year or two.”

“What!” cried Wilton with a mocking laugh. “If we started west to-morrow in a couple of good marches we should be right out on the salt plains again.”

“Perhaps so; but this Amurrica’s a bigger place than you think for, sir. We’re going south-west to-morrow, aren’t we, doctor, so as to get a lookout from that double-topped mountain where the tongue of desert came right in?”

“Yes; that is what I proposed,” said the doctor. “He is quite right, Wilton. We have seen only a little of one of the grandest parts of the country I have been in.”