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Mr. Ma's elder brother was bitten by a dog while walking in the village and was carried home. His lower leg swelled like a jar, hard as iron or stone. The pathogenic heat-toxin entered the interior, causing vomiting and inability to eat, accompanied by severe and heavy headache. He went to consult Dairen (Zhang Congzheng). A female servant said, "Pain is alleviated by purgation." Therefore, *Binglang Wan* (Areca Seed Pill) was administered to purge the bowels. Two movements of the bowels were passed, but the condition did not improve. Coincidentally, Dairen returned from Wuyang. He said to Mr. Ma, "With such severe swelling of the lower leg, can the six meridians of the foot (specifically the Foot Shaoyin Kidney and Foot Taiyang Bladder meridians) still circulate freely?" Mr. Ma replied, "They cannot circulate at all." Dairen said, "In that case, why not perform a strong purgation?" He instructed him to take 150 pills of *Zhouche Wan* (Boat and Cart Pill) and 3-4 qian of *Tongjing San* (Meridian-Penetrating Powder) just before going to bed at night. By midnight, he had defecated fourteen times. The swelling immediately subsided, the skin wrinkled like a walnut shell, and it became thinner than the uninjured leg. Dairen said, "Do not apply plaster; allow the pathogenic heat-toxin to exit, with pus, blood, and fluid flowing continuously." One day later, fearing the toxin was not fully expelled, Dairen had him take over 100 pills of *Zhouche Wan* and 3-4 qian of *Junchuan San* (River-Dredging Powder), resulting in six bowel movements. The patient asked, "Passing fourteen stools was easy to bear, but passing six is difficult now. Why?" Dairen explained, "When the disease is vigorous, it withstands the medicine; when the disease declines, it cannot withstand the medicine." After six days, the pus and fluid were completely exhausted. Dairen said, "While pus and fluid are flowing, wind-cold is not feared; after exhaustion, wind-cold will be feared." Thus, *Yufeng Bingzi* (Wind-Nourishing Cake) was prescribed, taken three times daily. Two days later, *Shengji San* (Flesh-Generating Powder) was applied once, forming a scab. Alas! The dosage of medicines varies greatly, leading to vastly different outcomes. Had he not met Dairen, the principle that 'pain is alleviated by purgation' would have been considered incorrect. From this, we know that understanding medicine is difficult, but skillfully employing physicians is even more so.

Zhang Zhongwen, the Wine Supervisor of Guyang Town, visited a temple and watched craftsmen building a terrace about four chi high. He climbed up and descended, but twisted his foot upon landing. The outer ankle swelled, feeling hot and painful as if on fire. One physician intended to puncture the swelling with a needle to release blood. Dairen urgently stopped him, saying, "The sprain already causes pain; adding needle puncture would cause both pains to arise simultaneously. How could one endure this?" Instead, he administered 80-90 pills of *Shenyu Wan* (Divine Protection Pill). The patient passed more than twenty stools. Hot foods were prohibited. At midnight, the swollen area became itchy, the pain ceased, and he walked normally. Dairen said, "My method cures ten out of ten cases; I do not deceive future generations."