This unique collection has been formatted to the highest digital standards and adjusted for readability on all devices. The papers brought together in this volume have, in a general way, been arranged in chronological sequence. They span a period of twenty-nine years of Muir's life, during which they appeared as letters and articles, for the most part in publications of limited and local circulation. The Utah and Nevada sketches, and the two San Gabriel papers, were contributed, in the form of letters, to the San Francisco Evening Bulletin toward the end of the seventies. Written in the field, they preserve the freshness of the author's first impressions of those regions.