John Muir, America’s pioneer conservationist and father of the national park system, was a man of considerable literary talent. As he explored the wilderness of the western part of the United States for decades, he carried notebooks with him, narrating his wanderings, describing what he saw, and recording his scientific researches. This reprint of his journals, edited by Linnie Marsh Wolfe in 1938 and long out of print, offers an intimate picture of Muir and his activities during a long and productive period of his life. The sixty extant journals and numerous notes in this volume were written from 1867 to 1911. They start seven years after the time covered in The Story of My Boyhood and Youth, Muir’s uncompleted autobiography. The earlier journals capture the essence of the Sierra Nevada and Alaska landscapes. The changing appearance of the Sierras from Sequoia north and beyond the Yosemites enthralled Muir, and the first four years of the journals reveal his dominating concern with glacial action. The later notebooks reflect his changes over the years, showing a mellowing of spirit and a deep concern for human rights.