In the course of the eighteenth century, alchemy perished in its own obscurity. Its method of explanation “obscurum per obscurius, ignotum per ignotius” (the obscure by the more obscure, the unknown by the more unknown) was incompatible with the spirit of enlightenment and particularly with the dawning science of chemistry towards the end of the century. But these two new intellectual forces only gave the coup de grace to alchemy. Its inner decay had begun at least a century earlier, at the time of Jakob Böhme, when many alchemists deserted their alembics and melting-pots and devoted themselves entirely to (Hermetic) philosophy. It was then that the chemist and the Hermetic philosopher parted company. Chemistry became natural science, whereas Hermetic philosophy lost the empirical ground from under its feet and aspired to bombastic allegories and inane speculations which were kept alive only by memories of a better time. This was a time when the mind of the alchemist was still grappling with the problems of matter, when the exploring consciousness was confronted by the dark void of the unknown, in which figures and laws were dimly perceived and attributed to matter although they really belonged to the psyche. Everything unknown and empty is filled with psychological projection; it is as if the investigator’s own psychic background were mirrored in the darkness. What he sees in matter, or thinks he can see, is chiefly the data of his own unconscious which he is projecting into it. In other words, he encounters in matter, as apparently belonging to it, certain qualities and potential meanings of whose psychic nature he is entirely unconscious.