Ink signature, "Bacon / Roger / The mirror of alchimy, W. Irving, April 9th, 19,” on an off-white 3.5 x 2.25 sheet. In fine condition, with scattered light foxing to the slip (and heavy foxing to the engraving, affecting appearance).
The Mirror of Alchimy is a short alchemical manual, known in Latin as Speculum Alchemiae. Translated in 1597, it was only the second alchemical text printed in the English language. Long ascribed to Roger Bacon (1214-1294), the work is more likely the product of an anonymous author who wrote between the thirteenth and the fifteenth centuries.
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