Naturalist and author (1838-1914) who helped establish Yosemite National Park. Boldly penned handwritten manuscript from Muir's working manuscript of 'The Mountains of California' on an off-white 8.75 x 4 sheet, no date but published (with revisions) in October 1894. In full: "flower. Grasses are especially abundant & grow tall & luxuriant, serving as pastures for 100s of 1000s of sheep, that are driven from the arid plains every summer as soon as the snow is melted." In fine condition, with some light edge toning.