ad straight walls and wound away out of sight. It was
the head of a canyon.

"Nonnezoshe Boco," said the Indian.

This then was the Canyon of the Rainbow Bridge. When we got down into
it we were a happy crowd. The mode of travel here was a selection of
the best levels, the best places to cross the brook, the best places
to climb, and it was a process of continual repetition. There was no
trail ahead of us, but we certainly left one behind. And as Wetherill
picked out the course and the mustangs followed him I had all freedom
to see and feel the beauty, color, wildness and changing character of
Nonnezoshe Boco.

My experiences in the desert did not count much in the trip down this
strange, beautiful lost canyon. All canyons are not alike. This one
did not widen, though the walls grew higher. They began to lean and
bulge, and the narrow strip of sky above resembled a flowing blue
river. Huge caverns had been hollowed out by water or wind. And when
the brook ran close under one of these overhanging places the running
water made a singular indescribable sound. A crack from a hoof on a
stone rang like a hollow bell and echoed from wall to wall. And the
croak of a frog--the only living creature I noted in the canyon--was a
weird and melancholy thing.

"We're sure gettin' deep down," said Joe Lee.

"How do you know?" I asked.

"Here are the pink and yellow sego lilies. Only the white ones are
found above."

I dismounted to gather some of these lilies. They were larger than
the white ones of higher altitudes, of a most exquisite beauty and
fragility, and of such rare pink and yellow hues as I had never seen.

"They bloom only where it's always summer," explained Joe.

That expressed their nature. They were the orchids of the summer
canyons. They stood up everywhere star-like out of the green. It was
impossible to prevent the mustangs treading them under foot. And as
the canyon deepened, and many little springs added their tiny volume
to the brook, every grassy bench was dotted with lilies, like a green
sky star-spangled. And this increasing luxuriance manifested itself
in the banks of purple moss and clumps of lavender daisies and
great mounds of yellow violets. The brook was lined by blossoming
buck-brush; the rocky corners showed the crimson and magenta of
cactus; and there were ledges of green with shining moss that sparkled
with little white flowers. The hum of bees filled the fragrant, dreamy
air.

But by and