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The ancients designated disease names by referring to their substantial nature. Since later generations termed it "Zhong Feng" (Wind Stroke), why abandon the treatment of wind and adopt other therapies? Observing Zhang Zhongjing's Hou Shi Hei San (Black Powder of Hou Shi) and Feng Yin Tang (Wind-Driving Decoction), the rationale becomes clear. This book was originally intended to establish principles for physicians of average or below-average aptitude, taking only one formula from the Tang Dynasty, Xu Ming Tang (Continuing Life Decoction), as the primary basis. This is because the wind syndromes listed by various schools are complex and numerous; the deeper the discussion, the more obscure it becomes, and the more methods there are, the more chaotic it gets. It is better to select a single formula with the expulsion of pathogenic factors as the foundation, so that the therapeutic method remains pure and unified, avoiding confusion caused by divergent approaches. One must understand that this decoction excels in treating external wind; if it is not wind, it should not be used; if it is wind, there is no case where it cannot be used. Regarding the statement that wind is a deficient pathogen and that treating wind requires first solidifying the orifices, this principle is subtle. If one can study the Hou Shi Hei San and Feng Yin Tang for ten years and grasp their essence, then one may learn together and attain the Dao.

Hou Shi Hei San (Black Powder of Hou Shi)
Treats severe wind causing heaviness and discomfort in the four limbs, and a sensation of cold and deficiency in the heart. (From *Waitai Miyao* [Essential Prescriptions Worth a Thousand Gold for Emergencies], treating wind-dian). The *Neijing* (Inner Canon) states: "Pathogens harm the orifices." This formula expels wind while simultaneously filling the orifices. When the orifices are filled, internal old pathogens cannot reside, and external new wind cannot enter.

Feng Yin Tang (Wind-Driving Decoction) (Both formulas appear in *Jin Gui Yao Lue* [Essential Prescriptions from the Golden Cabinet])
Treats heat-induced dian-xian (epilepsy/seizures). (Chao Yuanfang treats Hong Kong foot [podagra/gout]).
Adults suffering from Zhong Feng (Wind Stroke) with牵引 (traction/spasms) and children with jing-xian (startle epilepsy) experiencing chuan-rong (convulsions/twitching), all result from fire generating wind. The five zang organs are hyperactive to an extreme, and the pathogenic qi converges into the Heart. Jueyin Wind-Wood and Shaoyang Ministerial Fire coexist; when fire flares, wind arises; when wind arises, it carries the force of Wood to damage Earth (Spleen/Stomach). When Earth is diseased, fluids accumulate to form Phlegm, which flows into the four limbs causing paralysis. This formula uses Da Huang (Rhubarb Rhizome) as the sovereign herb to purge pathogenic factors of wind, heat, fire, and dampness. It is followed by Gan Jiang (Dried Ginger), whose stabilizing and non-migratory nature tonifies the body. Gui Zhi (Cinnamon Twig) and Gan Cao (Licorice Root) are used to moderate the pathogenic momentum. Mineral drugs (Stone Medicines) are employed for their astringent properties to block the path of the pathogen. Among these, Hua Shi (Talcum) and Shi Gao (Gypsum Fibrosum) clear Lung Metal to subdue Liver Wood. Chi Shi Zhi (Halloysitum Rubrum) and Bai Shi Zhi (Halloysitum Album) thicken Earth to eliminate dampness. Long Gu (Fossilized Bones) and Mu Li (Oyster Shell) restrain the chaotic rushing of spirit and soul. Han Shui Shi (Metastone) assists the True Yin of the Kidney, preventing it from being plundered by Yang Fire (Evil Heat). Zi Shi Ying (Fluorite) is added to tonify the deficiency of Heart Spirit, fearing that unclear Heart Spirit would endanger the Twelve Officials. Understanding these principles allows one to treat wind entering the Zang organs with ease and proficiency. Yu Jiayan's interpretation of this is the most exquisite.