Finished around 317, its 20 "inner chapters" (内篇) set out recipes for elixirs and the path to immortality, and its 50 "outer chapters" (外篇) discuss government and society in a Confucian spirit. It is a key source for early Chinese alchemy and medicine.
memory
抱朴 'to embrace simplicity' comes from the 道德经 phrase 见素抱朴. 朴 is read pǔ 'plain, simple' here, not Piáo, the Korean surname Park.