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After Brother Nong's illness was cured, his three-year-old daughter developed fever and red eyes. The physician diagnosed it as a heat syndrome caused by wind pathogen and prescribed Qianghuo Jingfang (Notopterygii Rhizoma et Radix with Saposhnikoviae Radix and Bupleuri Radix). Consequently, her eyes swelled like plums, discharge flowed like pus, fever intensified, and convulsions occurred. Her grandfather, Mr. Junyang, instructed me to treat her. I said: This is a syndrome of wind generated from heat; it must be cleared. The prescription consisted of Shengdi Huang (Rehmanniae Radix Preparata), Danpi (Moutan Cortex), Shanzhi (Gardeniae Fructus), Sheng Gancao (Raw Glycyrrhizae Radix et Rhizoma), Juhua (Chrysanthemi Flos), Sangye (Mori Folium), Shijueming (Concha Arcae), and Lingyangjiao (Saigae Tataricae Cornu). After taking the medicine, the fever subsided, convulsions ceased, and eye swelling disappeared. Mr. Junyang asked doubtfully: "My granddaughter's illness was diagnosed by another doctor as heat caused by wind, but you say it is wind caused by heat. Both involve 'wind'. Wind should be dispersed; why did dispersing agents worsen the condition while clearing agents resolved it quickly? What is the reason?" I replied: "The terms 'wind' and 'heat' cannot be used generally; one must distinguish between internal/external origins and root/branch relationships. In 'heat caused by wind', the wind is an external pathogen. When wind is excessive, heat is constrained. Dispersing the wind resolves the heat, which is known as 'releasing fire stagnation'. Here, wind is the root, and heat is the branch. In 'wind caused by heat', the wind arises internally. When heat is excessive, wind is generated. Clearing the heat extinguishes the wind, which is known as 'treating heat with cold'. Here, heat is the root, and wind is the branch." Physicians often err because they do not clearly understand the meanings of 'wind' and 'heat' and apply ambiguous treatments. Mr. Junyang sighed and said: "If both patients and physicians do not understand the principles, once the principles are clear, treating diseases becomes as easy as looking at one's palm."

An Bo commented: This is a profound insight.

Mr. Junyang's servant, Sheng Ji, was nearly twenty years old. At the beginning of late spring, he initially felt twitching pain in the head tendons, followed by deviation of the mouth and eyes, cool limbs, and a fine pulse. He was treated for external contraction of wind-cold with warming and dispersing herbs, but the condition worsened, presenting with limb jerking, dizziness, palpitations, and profuse sweating like syrup. Mr. Junyang had him carried to my residence and instructed me to provide medical care. According to the principle that all wind-related vertigo and tremors belong to the Liver, during deep spring when Wood energy grows strongly, if Water fails to nourish Wood, Yang transforms into internal wind, which invades the collaterals vacuously. In treating wind syndromes, one must distinguish between internal and external origins. External wind can be dispersed, but internal wind, if dispersed, only exacerbates its ascending and stirring momentum. Currently, there is twitching in the left limb, risking progression to spasm, coma, or loss of consciousness. The proposed treatment is to nourish Water to nourish Wood and harmonize Yang to extinguish wind. The prescription included Zhi Gancao (Prepared Glycyrrhizae Radix et Rhizoma), Heishen (Black Ginseng), Shudi Huang (Prepared Rehmanniae Radix), Maidong (Ophiopogonis Tuber), Ejiao (Donkey-hide Gelatin), Zhima (Sesamum Fructus), Fushen (Poria with Hostwood), Zaoren (Ziziphi Spinosomi Semen), Wuweizi (Schisandrae Fructus), Muli (Concha Ostreae), Xiaomai (Tritici Fructus), and Nanzao (Jujubae Fructus). After four doses, the condition improved. White Shaoyao (Paeoniae Radix Alba), Danggui (Angelicae Sinensis Radix), and Weirui (Polygonati Odorati Rhizoma) were added. After twenty doses, the disease was cured. However, deficiency remained, so pills were prepared. After several months, his original vitality was restored.