PREFACE xxix. 



whole towns with gold and silver. Even their books proclaim their vanity, for 

 they inscribe in them the names of Plato and Aristotle and other philosophers, 

 in order that such high-sounding inscriptions may impose upon simple people 

 and pass for learning. There is another class of alchemists who do not 

 change the substance of base metals, but colour them to represent gold or silver, 

 so that they appear to be that which they are not, and when this appearance 

 is taken from them by the fire, as if it were a garment foreign to them, they 

 return to their own character. These alchemists, since they deceive people, 

 are not only held in the greatest odium, but their frauds are a capital offence. 

 No less a fraud, warranting capital punishment, is committed by a third sort 

 of alchemists ; these throw into a crucible a small piece of gold or silver 

 hidden in a coal, and after mixing therewith fluxes which have the power of 

 extracting it, pretend to be making gold from orpiment, or silver from tin and 

 like substances. But concerning the art of alchemy, if it be an art, I will 

 speak further elsewhere. I will now return to the art of mining. 



Since no authors have written of this art in its entirety, and since 

 foreign nations and races do not understand our tongue, and, if they did 

 understand it, would be able to learn only a small part of the art through the 

 works of those authors whom we do possess, I have written these twelve books 

 De Re MetalUca. Of these, the first book contains the arguments which may 

 be used against this art, and against metals and the mines, and what can be 

 said in their favour. The second book describes the miner, and branches into 



Hermes Trismegistos was a legendary Egyptian personage 8up(>osed to have flourished 

 before 1,500 B.C., and by some considered to be a corruption of the god Thoth. He is supposed 

 to have written a number of works, but those extant have been demonstrated to date not 

 prior to the second Century ; he is referred to by the later Greek Alchemists, and was 

 believed to have possessed the secret of transmutation. Osthanes was also a very shadowy 

 personage, and was considered by some Alchemists to have been an Egyptian prior to Hermes, 

 by others to have been the teacher of Zoroaster. Pliny mentions a magician of this name 

 who accompanied Xerxes' army. Later there are many others of this name, and the most 

 probable explanation is that this was a favourite pseudonym for ancient magicians ; there 

 is a very old work, of no great interest, in MSS in Latin and Greek, in the Munich, Gotha, 

 Vienna, and other libraries, by one of this name. Agathodaemon was still another shadowy 

 character referred to by the older Alchemists. There are MSS in the Florence, Paris, Escurial, 

 and Munich libraries bearing his name, but nothing tangible is known as to whether he was 

 an actual man or if these writings are not of a much later period than claimed. 



To the next group belong the Greek Alchemists, who flourished during the rise and 

 decline of Alexandria, from 200 B.C. to 700 a.d., and we give them in order of their dates. 

 Comerius was considered by his later fellow professionals to have been the teacher of the art 

 to Cleopatra (ist Century B.C.), and a MSS with a title to that effect exists in the Bibliotheque 

 Nationale at Paris. The celebrated Cleopatra seems to have stood very high in the estimation 

 of the Alchemists ; perhaps her doubtful character found a response among them ; there are 

 various works extant in MSS attributed to her, but nothing can be known as to their 

 authenticity. Lucius Apulejus or Apuleius was born in Numidia about the 2nd Century ; 

 he was a Roman Platonic Philosopher, and was the author of a romance, " The Metamorphosis, 

 or the Golden Ass." Synesius was a Greek, but of unknown period ; there is a MSS treatise 

 on the Philosopher's Stone in the library at Leyden under his name, and various pnnted works 

 are attributed to him ; he mentions " water of saltpetre," and has, therefore, been hazarded 

 to be the earliest recorder of nitric acid. The work here referred to as " Heliodorus to 

 Theodosius " was probably the MSS in the Libraries at Paris, Vienna, Munich, etc., under 

 the title of " Heliodorus the Philosopher's Poem to the Emperor Theodosius the Great on the 

 Mystic Art of the Philosophers, etc." His period would, therefore, be about the 4th Century. 

 The Alexandrian Zosimus is more generally known as Zosimus the Panopolite, from Panopolis, 

 an ancient town on the Nile ; he flourished in the 5th Century, and belonged to the 

 Alexandrian School of Alchemists ; he should not be confused with the Roman historian 

 of the same name and period. The following statement is by Boerhaave {Elemenia Chemiae, 

 Paris, 1724, Chap. L) : — " The name Chemistry written in Greek, or Chemia, is so ancient 



