This Chapter is a section from the Yellow Emperor's Classic of Internal Medicine discussing cross needling (miu ci), an acupuncture technique. It explains the theory behind cross needling, differentiating it from opposite needling (ju ci), and details specific techniques for various ailments based on the affected collateral vessels. The text emphasizes treating pain and imbalances by needling points seemingly unrelated to the affected area, adjusting techniques based on the severity and location of symptoms. The final principles highlight the importance of precision and understanding the body's energy pathways.