COLBATCH, John (1670-1728). A physico medical Essay concerning Alkaly and Acid, London: Dan. Browne, 1696, small 8°, FIRST EDITION (closely shaved margins), contemporary sprinkled calf (skillfully rebacked, spine faded, corners rubbed), sprinkled edges. [Krivatsy 2559; Wellcome II, 368; Wing C5003]