The Neijing is one of the most important classics of Taoism, as well as the highest authority on traditional Chinese medicine. Its authorship is attributed to the great Huang Di, the Yellow Emperor, who reigned during the third millennium BCE. This new translation consists of the eighty-one chapters of the section of the Neijing known as the Suwen, or "Questions of Organic and Fundamental Nature" (The other section, called the Lingshu, is a technical book on acupuncture and is not included here.). The original text of the Neijing presents broad concepts and is often brief with details. The translator's elucidations and interpretations, incorporated into the translation, help not only to clarify the meaning of the text but also to make it a highly readable narrative for students - as well as for everyone curious about the underlying principles of Chinese medicine.