The Stone of the Philosophers: Now Available!
This work is quite interesting; written by Edward Kelly (sometimes spelled 'Kelley') while he was under imprisonment (either for murder or for failing to make gold using alchemy!) it is a discourse proving, he believes, several alchemical principles he held at the time, by referring to other parties' works; philosophers, alchemical authors, and works of alchemy of both known and unknown origin; the Rosary, the Turba, and many others.
The main overarching principle is quite clear and not veiled at all, possibly because Kelly wished to escape the dungeons of Rudolph II: That gold, silver, and mercury, and those in their elemental forms, are the only materials used within the main great work of alchemy. Kelly allows one exception; the work of Saturn, the creating of elixir using lead and/or antimony a-la Hollandus. Under duress, or apparently so, Kelly created a short but monumentally clear work containing little of the ambiguity of most contemporary chemical works.