This carefully arranged collection of writings presents Muir's own account of his arrival to Yosemite Valley and the formative years he spent living there. Muir's love of Yosemite was so pure and so intense he spent every waking moment roaming and scrambling around, with notebook in hand, writing down everything he saw in remarkable, poetic detail. This possession transformed him into a botanist, a zoologist, and a visionary glaciologist, leading to his discovery that Yosemite Valley and the Sierra Nevadas were sculpted by glaciers. If you're at all interested in John Muir's origins as a naturalist, scientist, and radical conservationist, this is a great place to start.