[DO NOT PARSE] Alchemical Engineering #Theory and Practice #50th Edition #PREFACE. Alchemy is the highest art; its practitioners guide the course of humanity. Throughout the ages, alchemists have steered society, advised kings and queens, and otherwise shaped the world around them. By choosing to dedicate your life to the study of alchemical engineering, you have taken the first step toward becoming a steward of this supreme knowledge and a guardian of its illustrious history.