"Glad I'm not going up," said Frank.
"Well, nothing is steep to me after the head wall of Huntington," Lou said. "I can see something under my feet here, at any rate."
The descent was rapid, for they dropped 1,300 feet in the five-sixteenths of a mile to the floor of the ravine, which means an ascent of 4,160 feet to the mile. Anybody good at mathematics can reckon out what this angle is. The boys estimated it roughly as they were descending at about seventy degrees. Nobody had time to figure it on paper, however, and when they got to the bottom, there was too much else to see. Anyhow, it was steep going!
They found the bottom of the ravine strewn with great boulders which had fallen down from the cliffs on three sides. Some of them were as big as houses, and in a cave under one they found ice. Two paths led down the ravine, one over the boulders called "Elevated Route for Rapid Transit," the other "The Subway."
The guide book said the latter took longer but was more interesting.
"The Subway for us!" cried Peanut.
So they took the Subway, and though it was not a second Lost River, this path took them by a tortuous route through several caves, and under many an overhanging boulder, where the air was chill and
