play, and often elbows, knees, thighs, upper arms, and even chin must grip and hold. Clambering up a steep slope, crawling under an overhanging rock, spreading out like a flying squirrel and edging along an inch-wide projection while fingers clasped knobs above the head, bending about sharp angles, pulling up smooth rock-faces by sheer strength of arm and chinning over the edge, leaping fissures, sliding flat around a dangerous rock-breast, testing crumbly spurs before risking his weight, always going up, up, no hesitation, no pause—that was Muir! My task was the lighter one; he did the head-work, I had but to imitate. The thin fragment of projecting slate that stood the weight of his one hundred and fifty pounds would surely sustain my hundred and thirty. As far as possible I did as he did, took his hand-holds, and stepped in his steps.