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Aconite (Fuzi, 附子) tastes pungent and sweet, possesses a great heat nature, and has significant toxicity. Processing method: It is boiled and soaked in the urine of a healthy young boy, then subjected to alternating mild (Wenhuo, 文火) and strong (Wuhuo, 武火) fire to reduce its toxicity and enhance its descending action; adding salt makes this effect particularly rapid. As an assistant or guide herb (Zuoshi Yao, 佐使之药), it circulates through all meridians. Its nature is agile and mobile rather than static, reaching the superficial, middle, and deep pulse levels without exception. It is "Yang within Yang," thus its movement is unceasing. When used appropriately, it achieves the merit of capturing flags and slaying generals; when used inappropriately, it brings the disaster of death. For every qian (approx. 3-5g) of Ginseng (Renshen, 人参) used as the sovereign herb, only 1-2 fen (approx. 0.3-0.6g) of Aconite should be used as the assistant herb, supplemented by Licorice Root (Gancao, 甘草) to resolve its toxicity. In cases of internal or external disorders, during severe cold weather, if there is a sunken ulcer, cold limbs, pain from cold-dampness, flaccidity with spasms, knee pain preventing walking, wind-cold affecting the waist and spine, latent yin cold damage, or cold damage with latent yin, then Aconite may be administered. If one fails to examine yin and yang deficiency and excess, and uses it indiscriminately, the patient may suffer from fire stagnating in the Middle Jiao (Zhongjiao, 中焦) and qi stagnating in the Lower Jiao (Xiajiao, 下焦), leading to roaring asthma and urgency, resulting in death within moments. Is it not essential to carefully examine before using Aconite?

It is also said: To resolve Aconite toxicity, allow the patient to inhale fresh air freely and drink several bowls of new water, inducing severe vomiting and diarrhea, which resolves the toxicity. This is another point that must be known.

Xue Lizhai stated: The Classics say: All pain, itching, sores, and ulcers belong to Heart Fire. If there is swelling, redness, irritability, fever, desire for cold drinks, constipation, thirst, and a surging, rapid, and full pulse, this is the normal presentation. Even in severe cold, large bitter-cold formulas must be used to drain heat. If the pulse is fine, skin is cold, there is diarrhea with borborygmus, inability to eat, frequent vomiting, and inverted cold of the hands and feet, this is an abnormal presentation. Even in peak summer, acrid-warm formulas must be used to assist Yang Qi. The *Neijing* states: Use cold remedies avoiding cold times, use hot remedies avoiding hot times; however, if there are false manifestations, reverse this rule. Although violating the season, one must follow the syndrome.

Wang Kentang stated: Swelling, redness, irritability, fever with preference for cold, constipation, thirst, and a surging, rapid, and full pulse constitute the "Five Excesses" (Wushi, 五实). Even in severe cold, large bitter-cold formulas must be used to drain Yang heat to save Yin fluids. Fine pulse, cold skin, diarrhea with borborygmus, inability to eat, frequent vomiting, and inverted cold of the hands and feet constitute the "Five Deficiencies" (Wuxu, 五虚). Even in peak summer, large acrid-hot formulas must be used to disperse Yin cold to restore Yang Qi. Adhering rigidly to standard methods leads to error. (*Yixue Zhunsheng*, Medical Standard)

Zhang Jingyue stated: I believe Mr. Luo's method of "abandoning the season to follow the syndrome" serves as an eternal teaching for future generations, truly an indispensable principle. However, changes in seasons are inherently difficult to know, and the subtle or obvious nature of syndromes is even harder to recognize. Why? Because what ordinary people call "seasons" refers merely to Spring, Summer, Autumn, and Winter, the dominant Qi of each year. Who does not know this? Yet they do not realize that through the cycles of the Five Movements and Six Qi, Long Summer may have commands of Cold Tyranny, and the Three Winters may have the authority of Heat and Summer. This appears to abandon the season but actually follows it. Can the ignorant understand this? Regarding syndrome examination, symptoms like fine pulse, cold skin, diarrhea, and cold limbs are already manifest cold syndromes; who does not know them? But one must not ignore their origin, severity, or gradual progression. Before these symptoms appear, the underlying condition may already exist, making it hard to misrecognize at that stage. If one waits until the head is scorched and forehead broken before taking preventive measures (Qu Tu Xi Xin, 曲突徙薪 - bending the chimney and moving the firewood), it is too late. This is why Mr. Luo clarified existing conditions. However, I worry more about non-existent conditions, fearing people will perceive them too late to be effective. Although I often see that modern physicians cannot even perceive existing conditions, let alone non-existent ones, which is indeed a grave error! Nevertheless, my sighing thoughts compel me to explain in detail, deeply hoping for those who understand.