Where the great highway of the Sierras nears the summit, and the pines begin to show sterile reaches of rock and waste in their drawn-up files, there are signs of occasional departures from the main road, as if the weary traveller had at times succumbed to the long ascent, and turned aside for rest and breath again. The tired eyes of many a dusty passenger on the old overland coach have gazed wistfully on those sylvan openings, and imagined recesses of primeval shade and virgin wilderness in their dim perspectives.