""The Alchemist of Nature and Concerning the Entity of Poison"" is a book written by Paracelsus, also known as Theophrastus. It is a collection of his works on alchemy, natural philosophy, and the nature of poison. Paracelsus was a Swiss physician and alchemist who lived in the 16th century and is considered one of the fathers of modern medicine. In this book, he explores the properties of various substances and their effects on the human body, as...