cate green of whose foliage contrasted wonderfully with the dead
gray walls of the deep, dark canyon at that point.

For some three miles below this the Pony Riders followed the
smoothly-gliding stream through a canyon whose straight up and down
walls of gray limestone seemed to meet overhead in the blue of the sky.
Below they seemed to be in the tropics. During that first day in the
Cataract they saw another wonder, that of the filmy clouds settling down
and forming a roof over the Canyon. It was a marvelous sight before
which the Pony Rider Boys were lost in wonder.

The Bridal Veil Falls they thought the most beautiful wonder of its
kind they had ever seen. Here they saw the crystal waters dashing in
clouds of spray through masses of ferns, moss and trees, one hundred
and seventy-five feet perpendicularly into a seething pool below.

Their delight was in the innumerable caves found along the Canyon. In
these were to be seen flowers fashioned out of the limestone,
possessing wonderful colors, scintillating in the light of the torches,
reds that glowed like points of fire, stalactites that glistened like
the long, pointed icicles they had seen hanging from the eaves of
their homes in Chillicothe. They discovered lace-work in most delicate
tints, masses and masses of coral and festoons of stone sponges in all
the caves they visited. There were little caves leading from larger
caves, caves within caves, caves below caves, a perfect riot of caves
and labyrinths all filled with these marvelous specimens of limestone.

"I think I would be content to live here always," breathed Tad after
they had finished their explorations of the caves and passed on into a
perfect jungle of tropical growth on their way to Ko-ho-ni-no, the
canyon home of the Havasupais.

"You'd never be lonesome here," smiled Nance.

"Why don't you live down here, then?" asked Ned.

"Perhaps I don't live so far from here, after all," rejoined the guide.

"Do they have ghosts in this canyon?" asked Chunky apprehensively.

"Full of them!"

"Br-r-r!" shivered the fat boy.

"A wonderful place for scientific research," mused the Professor.

"Why don't you stay in Bright Angel for a while and study ghosts?"
suggested Stacy.

"I decline to be drawn into so trivial a discussion," answered Professor
Zepplin severely.

"You wouldn't think it was trivial were you to see one of those things."

"Perhaps the Professor, too, has overloaded his stomac