s. A narrow
gulch is cut into the wall of the main canyon. Follow this up and the
climb is rapid, as if going up a mountain side, for the gulch heads but
a few hundred or a few thousand yards from the wall. But this gulch has
its side gulches, and as the summit is approached a group of radiating
canyons is found. The spaces drained by these little canyons are
terraced, and are, to a greater or less extent, of the form of
amphitheaters, though some are oblong and some rather irregular. Usually
the spaces drained by any two of these little side canyons are separated
by a narrow wall, 100, 200, or 300 feet high, and often but a few feet
in thickness. Sometimes the wall is broken into a line of pyramids above
and still remains a wall below. There are a number of these gulches
which break the wall of the main canyon of the Green, each one having
its system of side canyons and amphitheaters, inclosed by walls or lines
of pinnacles. The course of the Green at this point is approximately at
right angles to that of the Colorado, and on the brink of the latter
canyon we find the same system of terraced and walled glens. The walls
and pinnacles and towers are of sandstone, homogeneous in structure but
not in color, as they show broad bands of red, buff, and gray. This
painting of the rocks, dividing them into sections, increases their
apparent height. In some places these terraced and walled glens along
the Colorado have coalesced with those along the Green; that is, the
intervening walls are broken down. It is very rarely that a loose rock
is seen. The sand is washed off, so that the walls, terraces, and slopes
of the glens are all of smooth sandstone.

In the walls themselves curious caves and channels have been carved. In
some places there are little stairways up the walls; in others, the
walls present what are known as royal arches; and so we wander through
glens and among pinnacles and climb the walls from early morn until late
in the afternoon.

_July 21.--_ We start this morning on the Colorado. The river is rough,
and bad rapids in close succession are found. Two very hard portages are
made during the forenoon. After dinner, in running a rapid, the "Emma
Dean" is swamped and we are thrown into the river; we cling to the boat,
and in the first quiet water below she is righted and bailed out; but
three oars are lost in this mishap. The larger boats land above the
dangerous place, and we make a portage, which occupies all th