“My, but that was a narrow escape,” derided Ned. “Just think of it, Professor.”

“Gid ap,” commanded Professor Zepplin. “Look sharp that none of you does worse.”

Now and then reaching a spot where they could get an unobstructed view of the distance the boys were fairly thrilled by the sight of the jagged peaks, sparkling in the sunlight, many hidden in the clouds and too high to be seen. It was an awesome sight and at such times stilled the merry voices of the Pony Rider Boys as they gazed off over the array of wonderful heights.

“What are they?” asked Ned when he first caught sight of this vista of mountain peaks.

“The first one should be Mt. Lituya and the next Mt. Fairweather,” Tad replied.

“That is correct, according to the map,” spoke up the Professor. “The former is ten thousand feet high, the latter five thousand, five hundred.”

A series of low wondering whistles were heard from the lips of the boys. It did not seem possible that the distance to the tops of those mountains could be so great.

66“I should like to climb one of the highest,” declared Butler.

“You can’t,” answered the Professor sharply.

“Why not, Professor?”