proved to be a better pilot across their deathly crevasses. Half a mile of careful walking and jumping and we were on the ground again, at the base of the great cliff of metamorphic slate that crowned the summit. Muir's aneroid barometer showed a height of about seven thousand feet, and the wall of rock towered threateningly above us, leaning out in places, a thousand feet or so above the glacier. But the earth-fires that had melted and heaved it, the ice mass that chiseled and shaped it, the wind and rain that corroded and crumbled it, had left plenty of bricks out of that battlement, had covered its face with knobs and horns, had ploughed ledges and cleaved fissures and fastened crags and pinnacles upon it, so that, while its surface was full of man-traps and blind ways, the human spider might still find some hold for his claws.
