DALTON, JOHN. Meteorological Observations and Essays. London: for W. Richardson, J. Phillips, and W. Pennington, 1793. 8vo, original wrappers, uncut, backstrip defective. FIRST EDITION. Norman 574; Wheeler Gift 582. The author's first book, concerning evaporation and later developed into his later chemical atomic theory. The appendix contains the first appearance of "Dalton's Law" of partial pressures: each gas acts as an independent entity in a mixture of gases. Early signatures: "Benjamin Townson, Colthoun School" and "Thos. Bowman"; later bookplate of Albert Parson Sachs -- [With]: COTTE, LOUIS. Trait de Mtorologie. Paris: l'Imprimerie Royale, 1774. 14 engraved plates including one folding. 4to, contemporary mottled calf, spine gilt, light wear to joints and edges. FIRST EDITION. Includes an historical description of the barometer, thermometer and other meteorological instruments. (2)