The Rosie Crucian Secrets: Their Excellent Methods of Making Medicines of Metals Also Their Lawes and Mysteries is a great insight on what the "Art and Science" of Alchemy was and what Alchemists ere trying to achieve. The original manuscript is attributed to Dr John Dee and it is a detailed guide on the study of Alchemy and the pursuit of the creation of alchemical substances, medicine, philosophic "stones" and more. It theory and also practical guidelines, recipes, instructions and general advice on the subject. It is considered by many to be one of the best textbooks for those interested in following the alchemical practices. About the Author: John Dee (July 13, 1527 - 1608), was the personal advisor of Queen Elisabeth I and an important advocate of England's imperial expansion to what is known as the "British Empire." He was a celebrated scientist and occultist with extensive studies and experience in astronomy, geography, mathematics, politics, philosophy, astrology, divination, alchemy and the hermetic arts.