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Aquinas, On the Being & Essence of minerals, contains four chapters.
| The first chapter treats of the Being of the stone | 123 |
| The second of the Being of Metal | 132 |
| The third of the Being of Metals through artifice | 134 |
| The fourth of minerals, namely how gold and silver are made by artifice | 138 |
rodius dedicated to Elizabeth, Queen of England, treats of making two oils for the divine Elixir
| The first is the Philosophical oil | 144 |
| The second is the Sperm of metals | 147 |
| To make strong water Aqua fortis | 148 |
| To make royal water Aqua regia | ibid. |
| To make the water which the Philosophers called by various names to conceal it, such as Virgin’s Milk, Menstruum, but most powerfully and frequently Mercurial water, which is the key to the whole of Philosophy. | 150 |