DAVY, Humphrey (1778-1829). Elements of Chemical Philosophy, London: J. Johnson, 1812, volume I, part I [all published], 8° (225 x 135mm.), FIRST EDITION, 12 engraved plates (lacking front free endpaper, stain to title and first 8 leaves, marginal dampstaining to a few plates, occasional light spotting and soiling), original boards (rebacked, old spine label preserved and laid down), uncut. [Duveen 160: "one of the earliest connected treatises on physical chemistry ... incorporating the results of the important discoveries made by the author"; Norman 609; Sotheran, I 974]; Six Discourses delivered before the Royal Society, London: John Murray, 1827, 4° (293 x 230mm.) (light marginal soiling, a few marginal tears, new endpapers), modern calf-backed boards, uncut. [Dawson 1737] (2)