When John Muir died in 1914, the pre-eminent American naturalist, explorer, and conservationist had not yet written the second volume of his autobiography, in which he planned to cover his Yosemite years. Editors Robert Engberg and Donald Wesling have here provided a remedy. Their account begins in 1863, the year Muir left the University of Wisconsin for what he termed the "University of the Wilderness." Following an accident in 1867 that...