Early in 1871, when Major Powell* was preparing for his second descent through the canyons of the Green and Colorado rivers, he was besieged by men eager to accompany him; some even offered to pay well for the privilege. It was for me, therefore, a piece of great good fortune when, after an interview in Chicago with the eminent explorer, he decided to add me to his small party. I was very young at the time, but muscular and healthy, and familiar with the handling of small boats