  Information on medicine and pharmacology appears in the sixth section, Recipes and Methods. It includes works on medicine and longevity, including medical classics, classical recipes, sexual arts, and immortality practices. These chapters reflect the concerns and expertise of the technical and ritual specialists closely associated with the “Recipe Masters” (fang shi 方士) associated with the Han court. But their concerns also appear in early philosophical texts, and the separation of philosophy from the categories of religion and science is artificial and problematic (Harper 1998 and 1999; Kalinowski 2004). Recipes and Methods (fang ji 方技) includes: Medical Classics (yi jing 醫經), Classical Recipes (jing fang 經方), Sexual arts (fang zhong 房中) and Immortality practices (shen xian 神仙).