Metallographia or an History of Metals : wherein is declared the signs of Ores and Minerals both before and after digging, the causes and manner of their generations, their kinds, sorts and differences; with the description of sundry new Metals, or Semi-Metals, and many other things pertaining to mineral knowledge / by John Webster : as also the handling and shewing of their Vegetability and the discussion of the most difficult questions belonging to Mystical Chymistry as of the Philosophers Gold, their Mercury, the Liquor Alkahest, Aurum potabile and such like...