8vo (229 x 139 mm). Large map folding in pocket at rear (a few tiny tears along folds); 4 lithographed maps (2 folding); 22 lithographed plates. (Dampstaining in lower gutter margin, some spotting and browning.) Original brown blind-stamped cloth, gilt-lettered on spine (some rubbing and staining, minor losses to spine ends). Provenance: Captain John Farnshaw (signatures title and flyleaf).

FIRST EDITION, the Senate issue, with the astronomical and meteorological observations omitted from the House issue and subsequent editions (see next lot). The two reports, written with the help of Fremont's wife Jessie Benton, "caught the public imagination: images of Fremont's guide, the then little-known Christopher 'Kit' Carson, riding bareback across the prairie, and Fremont himself, raising a flag on a Rocky Mountain peak, entered the national mythology" (Pamela Herr, ANB). Graff 1436; Howes F-370; Sabin 25845; Streeter VI:3131; Wagner-Camp 115:1.