Official testimonies of the benefits arising from the essence or extract of malt [electronic resource] : As used in the British Navy, for making wort at sea: consisting of short extracts from the best writers; from medical journals kept on board the King's ships; and from the testimony of surgeons appointed by the Lords of the Admirality to examine and report its virtues, in the prevention and cure of the scurvy and other putrid diseases. Prepared and sold by Holdsworth & Barnard, (No 80) East-Smithfield, under the encouragement and protection of His Majesty's letters patent, granted to the Late Mr. Thornton.