across my path—a gash in the rock, as if one of the Cyclops had struck it with his axe. It sloped very steeply for some twelve feet below, opening on the face of the precipice above the glacier, and was filled to within about four feet of the surface with flat, slaty gravel. It was only four or five feet across, and I could easily have leaped it had I not been so tired. But a rock the size of my head projected from the slippery stream of gravel. In my haste to overtake Muir I did not stop to make sure this stone was part of the cliff, but stepped with springing force upon it to cross the fissure. Instantly the stone melted away beneath my feet, and I shot with it down towards the precipice. With my peril sharp upon me I cried out as I whirled on my face, and struck out both hands to grasp the rock on either side.
