How vividly my own first camping trip in the Sierra comes to mind! This last summer I wanted to go to Alaska to explore some fine busy glaciers that are working on the flanks of Mt. St. Elias and the mountains about Cook's Inlet and Prince William's Sound. But I could not get away early enough for such extended explorations as would be required there; and so I just rambled off for an easy six weeks' saunter in the Sierra above Yosemite, and about the head waters of the Tuolumne, and down the Grand Cañon of the Tuolumne to Hetch Hetchy and the sugar pine woods of the main forest belt. If your world is similar to the world of the ancients, then you may easily imagine that one day you suddenly come upon a sixth or a seventh continent, upon some Atlantis. The sun, it was no longer our light evenly diffused over the mirror surface of the pavements; it seemed an accumulation of living fragments, of incessantly oscillating, dizzy spots which blinded the eyes. And the trees! L