John Muir, The Treasures of the Yosemite. Century, August 1890. From Tony Perrottet, John Muir’s Yosemite, Smithsonian, July 2008: “In 1889, in his early 50s, Muir camped with Robert Underwood Johnson, an editor of Century magazine, in Tuolumne Meadows, where he had worked as a shepherd in 1869. Together they devised a plan to create a 1,200-square-mile Yosemite National Park, a proposal Congress passed the following year. In 1903, the 65-year-old Muir and President Theodore Roosevelt were able to give Secret Service agents the slip and disappear for three days, camping in the wild. It was during this excursion, historians believe, that Muir persuaded the president to expand the national park system and to combine, under federal authority, both Yosemite Valley and Mariposa Grove, which had remained under California jurisdiction as authorized by Lincoln decades before. Unification of the park came in 1906.”