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During the Xuanhe era, Imperial Physician Dai Kechen said to officials of the Hanlin Academy that he had obtained two printed copies of *Uncle Shu's Pulse Instructions for Children*. One copy stated: "In respiration, one must observe six pulsations," while the other stated: "In respiration, one must observe eight pulsations." He then consulted with Gao Shi from the Neitai (Inner Court) to examine the character meanings and pulse counts. By diagnosing the normal pulse of a five-year-old child, they confirmed that six pulsations per respiration were correct, whereas eight were incorrect. This error occurred because, during the woodblock printing process, a dot and a stroke on top of the character "six" (六) were accidentally omitted, making it resemble the character "eight" (八), leading to this erroneous transmission. This is similar to the later mistake of writing "Zu yi xue yi" instead of "Wushi yi xue yi" (referring to Confucius studying the I Ching at fifty). I have examined Zhang Shi of Mo'an's *Pulse Instructions*, which also states: "The normal pulse in children is two pulsations more than adults, which is considered peaceful," i.e., six pulsations. Thus, within one inhalation and exhalation, six pulsations are clear. If not so, let future scholars verify it.

Zheng commented on ancient medical texts, stating they inevitably contain errors. For instance, Qian Yi used Gualou Tang (Trichosanthes Decoction) to treat slow convulsion (Man Jing Feng), which did not correspond to the disease; this is called an error. In my opinion, knowledge of herb properties should be understood by physicians. Even if the aforementioned symptoms existed, they might not necessarily use the formula, but this does not preclude explaining it clearly. Little do people know that after Qian Yi passed away, his works were compiled and published by Shi Lu, specifically edited and printed by Yan Xiaozhong, surviving through multiple dynasties. Moreover, Qian Yi was a scholar-physician renowned throughout the court and common society. His treatment methods were like pearls on a string, never deviating slightly. Regarding Zheng's claim that Gualou Tang was mistakenly used for slow convulsion, the original text under this formula clearly states it treats lung heat with abundant phlegm-rheum, not for slow convulsion. Would Yan Xiaozhong not have known this? Perhaps when he was recording and printing books during his official tenure, he failed to cross-reference carefully, causing this formula to be erroneously transmitted, thus triggering the previous discussion. Now, many years have passed, making correction difficult. However, regarding the subtleties of tonifying and purging the five zang organs, there are no flaws to point out. As for various miscellaneous formulas, their benefits to the world are considerable. The book *Zhi Jue* (Direct Instructions) is indeed trustworthy.

Regarding Zhang's method for treating smallpox in children, he stated that as soon as the syndrome is identified, one should use purgative or draining methods. He also said: "When the rash first appears, purgative methods should not be used." By presenting two contradictory statements, he caused much confusion among later generations, leaving them unsure which approach to follow. This represents a discrepancy in Zhang's discourse. Liu Maoxian said: "Smallpox in infants and toddlers belongs to interior syndromes; from beginning to end, purgative methods should not be used. If purged, the interior will become deficient, and how can the toxic factors be vented? It will inevitably lead to disease progression. Generally, one must protect the child to ensure complete safety." Liu Maoxian's words are correct. However, junior practitioners should not adhere rigidly to one view but should select the better approach to follow. There are also children with robust constitutions whose smallpox rashes appear bright red and lustrous over the whole body, with smooth digestion and no exterior symptoms, leading to rapid natural recovery. Folk remedies such as talisman water and divine medicines are not good methods; one must be cautious and not easily believe them.