Paper, 'On a method of obtaining pure silver from ores containing it in various alloys' by Sir H [Humphry] Davy Includes original envelope which reads 'April 20, 1825. Royal Society. On a process for extracting silver from its ores. Not to be read except by direction of the Pres. H.D.' Subject: Metallurgy Not published in Philosophical Transactions. 29 March 1825