Boyle (Robert) Medicina Hydrostatica: or, Hydrostaticks Applyed to the Materia Medica, first edition, engraved frontispiece depicting Boyle's scales, with 8ff. catalogue of Boyle's works at end (as in most copies), cancelled title A1 present but torn with much loss, ff. of Preface present but bound in wrong order, bookseller's ticket of Henry Kimpton, small water-stain to frontispiece fore-margin, b1 with some marginal loss, few other small marginal defects, occasional light spotting, 18th century vellum-backed marbled boards, small loss to spine head, quite worn, few ff. unopened, [Fulton 189; Wing B3988], 8vo, for Samuel Smith, 1690.

⁂ The first tract in English on the determination of specific gravity, written by Boyle the year before his death. "The principle of weighing bodies in the air and in water dates from the time of Archimedes or probably earlier, but it was Boyle who first directed the attention of physicists and chemists to the importance of specific gravity" (Fulton).