Rocks overhanging the Colorado's Gorge.......................... 122

Thirteen hundred feet above the Green River..................... 124

The junction of the Green and the Grand Rivers.................. 128

Looking west into Cataract Canyon............................... 132

Charles Smith and his boat...................................... 132

A narrow channel at Rapid No. 22................................ 136

Developing tests................................................ 136

Rapid No. 22 in Cataract Canyon................................. 140

The _Edith_ in a cataract....................................... 144

A seventy-five-foot drop in three-fourths of a mile............. 144

Camp in the heart of Cataract Canyon............................ 148

Lower Cataract Canyon. Boats tandem............................. 152

Beginning of a natural bridge. Glen Canyon...................... 152

Pictographs in Glen Canyon...................................... 158

Cliff ruins near San Juan River................................. 162