Twelfth Key of Basil Valentine

Inside a laboratory an alchemist stands with tongs in his left hand, while with his right he points to a triangular crucible on a bench behind him, with two rose-like flowers growing out of it and the symbol of Mercury above it. On the left is a barrel-like furnace from the top of which flames emerge. On the right a lion devours a snake. Through an open window behind, the Sun and Moon are seen.