[I first climbed Half Dome on] one of those brooding days that come just between Indian summer and winter, when the clouds are like living creatures.
Source, in full
"South Dome", San Francisco Daily Evening Bulletin (part 11 of the 11 part series "Summering in the Sierra") dated 10 November 1875, published 18 November 1875; reprinted in John Muir: Summering in the Sierra, edited by Robert Engberg (University of Wisconsin Press, 1984) page 147