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Shuilangdang (Water Henbane) is not recorded in other books. *Bencao Jing* (Divine Farmer's Materia Medica) records Langdang (Henbane), stating it is bitter, cold, and non-toxic, capable of facilitating spiritual communication and seeing ghosts; excessive consumption causes people to run wildly. This aligns largely with the current text, except for the claim that it is "non-toxic," which contradicts reality. *Bencao Gangmu* (Compendium of Materia Medica) directly quotes this text under the entry for Langdang, implying that Shuilangdang is identical to Langdang. However, Langdang is not a vegetable and is rarely used; why would Zhang Zhongjing worry about its accidental ingestion? Li Shi-zhen must have been mistaken. Examination of *Baiyi Fang* states: "Among vegetables, there is Shuilang, with round and shiny leaves, growing by the water. It is toxic; crabs become poisoned after eating much of it. If humans accidentally ingest it, they exhibit madness resembling stroke symptoms or hematemesis, which can be detoxified with Licorice juice." This discussion is entirely based on the current text but identifies it as "Shuilang." In the original text, "Lang" is pronounced like "Gen" from the I Ching hexagram, and "Dang" is a superfluous character. Shuilang resembles Shuijin (Water Violet); since Jin belongs to the vegetable category, it is said that Shuilang exists among vegetables. Because it resembles Jin, a warning against accidental ingestion is noted. The basis of *Baiyi Fang* is likely correct. Furthermore, the preceding section mentions Gouwen (Aconite Root) resembling celery, where accidental ingestion is fatal. Some commentators suggest Gouwen resembles Maoie (Buttercup). The "Guanglang" mentioned here corresponds to the previous section, both serving to distinguish similar plants that might be confused with celery. The following section discusses Jiaolong disease, further clarifying treatments for those who consumed celery. These sections specifically clarify the contraindications regarding celery, clearly indicating this is not about Langdang. Such errors urgently need correction for clarity, yet no one has commented on this, sighing at the difficulty of reading ancient texts.

In ancient times, Nao (Brain) and She (Musk) were used to treat Shu (Summerheat), while Changshan (Cinchona Bark) and Shuku (Periploca Seedling) were used to treat Nuemie (Malaria). Although the methods differed, the intentions were the same. Why? Intangible Summerheat pathogen obstructs and adheres to the chest diaphragm, steaming phlegm into solid accumulation. Since it cannot be treated by sweating out exterior cold nor purging interior excess, medicines with potent aromas and lifting properties are required to reach the disease site directly, driving out phlegm. Only then can the intangible pathogen lose its support and depart. Treating Malaria requires Changshan and Shuku, just as treating Summerheat requires Brain and Musk; the difference lies only in the depth of the pathology, each having its appropriate application. Today, when treating Summerheat, practitioners still know to follow ancient methods, but regarding Changshan and Shuku, everyone claims they cause complications when used to stop malaria. However, I have personally observed in Suzhou, Wujiang, and Zhenze that locals call Changshan "Sweet Tea." When malaria strikes, they gather a large handful of fresh Changshan and decoct it for consumption. Mild cases resolve, severe cases improve, and I have never heard of complications arising after resolution. My own use of this method yields similar results. The term "Jie" (intercept/cut off) implies blocking. Medicines that can block the pathway of pathogens must possess astringent and obstructive properties sufficient to stagnate meridians, thereby retaining evil and causing complications. This is beyond the capacity of the lifting and dispersing nature of Changshan and Shuku. Those holding this view should examine *Waitai Miyao* (Essential Prescriptions Worth a Thousand Gold for Emergencies) and *Shengji Zonglu* (General Records of the Sage's Relief), which collect thousands of famous prescriptions for treating Malaria from the Han, Wei, and subsequent dynasties over a thousand years. Among these, nine out of ten use Changshan and Shuku.