The supplement to a small treatise called Salt-water sweetned : shewing the great advantages both by sea and land, of sea-water made fresh. Together with the Honourable Mr. Boyle's letter, and the approbation of the Colledge of Physicians, of the wholsomness of this water. And also the conditions on which the patentees and others concern'd, do intend to contract with such as shall please to deal with them for the use of his invention.