its way the many mountain streams whose waters fill the solitude with perennial music--a symphony of cascades. In Middle Park boiling springs issue from depths below and gather in pools covered with con-fervae. Leaving Middle Park the river goes through a great range known as the Gore's Pass Mountains; and still it flows on toward the Colorado, now through canyon and now through valley, until the last forty miles of its course it finds its way through a beautiful gorge known as Grand River Canyon. In its principal course this canyon is a bright red homogeneous sandstone, and the walls are often vertical and of great symmetry. Farther down, its walls are rugged and angular, being composed of limestones. The principal tributaries from the south are the Blue, which heads in Mt. Lincoln, and the Gunnison, which heads in the Wasatch Mountains. These streams are also characterized by deep canyons and plateaus, and mesas abound on every hand. Between the Grand River and the White River, farther to the east, the Tavaputs Plateau is found. It begins at the foot of Gore's Pass Range and extends down between the rivers last mentioned to the very brink of Green River, which is in fact the upper Colorado. Between the Grand River and the powell-canyons-33.jpg A NAVAJO BOY. 60 CANYONS OF THE COLORADO. foot of this plateau there is a low, narrow valley with mesas and buttes. Then the country suddenly rises by a stupendous line of cliffs 2,000 or 3,000 feet high. These cliffs are composed of sand stones, limestones, and shales, of many colors. The stratification in many places is minute, so that they have been called the Book Cliffs. powell-canyons-34.jpg GARDENS OF ZUÑI. From the cliffs many salients are projected into the valleys, and within deep re-entering angles vast amphitheaters appear. About the projected salients many towering buttes, with pinnacles and minarets, are found. The long, narrow plateau is covered with a forest along its summit, and, though it rises abruptly on the south side from Grand River Valley, it descends more gently toward the White River, and on MESAS AND BUTTES. 61 powell-canyons-35.jpg A TUSAYAN LADDER.