This Chapter is an excerpt from Chapter 6 of the Yellow Emperor's Classic of Internal Medicine, specifically focusing on longevity, mortality, and the balance of yin and yang in the body. It details diagnostic methods involving the observation of physical characteristics and symptoms to determine the nature of illness. The text then explains acupuncture techniques for treating various ailments based on the location and type of imbalance (yin or yang), and it offers detailed instructions for preparing and using medicated compresses. Finally, it explores the relationship between physical form, qi, and lifespan prediction.