The document discusses the "Dry Way of Antimony" in alchemy. It involves several steps:
1) Preparing stibnite ore through "assation" and "purgation" to produce the "Antimony of the Sages."
2) Purifying the stibnite through "distillation per descensum" in a refractory clay crucible in a furnace.
3) Subjecting the purified stibnite to "separation" using mars, nitre, and salt of tartar in a multi-step chemical process performed in glassware and using the furnace.