the Garden on.

As a matter of fact, Dad had led them into new fields. But at last they
stood upon the surer foundation of the bottom of the chasm.

"Anyone needs to be a mountain goat to take that journey," said Tad, with
a laugh.

"No, a bird would be better," piped Stacy.

"I'd rather be a bug, then I wouldn't have to climb," spoke up Walter.

"Hurrah! Walt's said something," shouted Ned.

By this time Nance and the Professor had walked along, climbing over
boulders, great blocks of stone that had tumbled from the walls above,
making their way to the edge of the river.

The others followed, talking together at the tops of their voices,
laughing and joking. They felt relieved that the terrible climb had
come to an end. As they approached the river, their voices died away.
It was a sublime but terrifying spectacle that the Pony Rider Boys gazed
upon.

"This is more wonderful than Niagara," finally announced the Professor.
"The rapids of the Niagara River would be lost in this turbid stream."

Great knife-like rocks projected from the flood. When the water struck
these sharp edges it was cleanly cut, spurting up into the air like
geysers, sending a rainbow spray for many yards on either side.