Two volumes bound as one. 8vo First item: second enlarged edition, Koenigsberg, Nicolovius 1794, xxvi, [4] [1-3], 4-314. Second item: fourth edition, Riga; Hartnoch, 1797, (1-3), 4-292. Early cloth, front hinge worn, small stamp to each title `ex libris Prehoffer.` Slight browning, otherwise nice clean early examples of these famous works.