Roger Bacon: The Mirror of Alchimy

[Paul Ferguson]

"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."

Wiki: 
https://en.wikipedia.org/wiki/The_Mirror_of_Alchimy

Text at Internet Archive:
https://archive.org/details/mirrorofalch...1/mode/2up