This fairly beefy alchemical tract (technically two tracts in multiple sections) comes from the Alchemical Museum of Waites' time, originally penned by Sendivogius in the 1600s. It is strictly physical alchemy at work here, and strictly the more "authentic" path of the same, not like some works which are basically about just creating interesting medicines (few of which were safe!)...
This very short tract is an excellent primer to alchemy; it's actually more an explanation of the veils and hidden meanings of the terms used by other works than it is a process in its own right- the author is anonymous, but Waite dug it up and managed to translate it. Altogether, when paired with other longer, more literal works, it's of far greater value than its general...