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[Ping An]: This section, from the beginning of the chapter to "do not stop," is found in Volume 9, Chapter 31 "Re Lun" (Treatise on Heat Diseases) of the *Su Wen* (Basic Questions). The final sentence of this section is found in Volume 16, Chapter 61 "Shui Re Xue Lun" (Treatise on Water and Heat Acupoints) of the *Su Wen*, and also in Volume 7, Chapter 1 of the *Jia Yi Jing* (Systematic Classic of Acupuncture and Moxibustion).

Whenever a disease originating from Shang Han (Cold Damage) transforms into Wen Bing (Warm Disease), those manifesting before the Summer Solstice are classified as Wen Bing, while those manifesting after the Summer Solstice are classified as Shu Bing (Summerheat Disease). In such cases, sweat should be allowed to discharge naturally; it should not be forcibly stopped.

The term "Xuan Fu" refers to the pores through which sweat exits. [If one suffers mild cold injury in winter, the disease manifests as Wen Bing before the Summer Solstice. If one suffers severe cold injury in winter, the disease manifests as Shu Bing after the Summer Solstice. In Shu Bing, the pathogenic heat is expelled along with sweat; since the heat has departed, sweating should not be suppressed. The pores where sweat emerges are called Xuan Fu, referring to the Cou Li (interstices of skin and muscles).] [Ping An]: The *Su Wen* and *Jia Yi Jing* read "Shu dang yu han" (Summerheat should be treated with sweating) instead of "Bing zhe dang yu han." The *Jia Yi Jing* reads "Han Kong" (sweat hole) instead of "Han Kong." Additionally, the New Collation of the *Su Wen* cites Yang Shangshan's commentary, stating that both instances of "yu" in "fa yu" function as grammatical particles.

[Ping An]: This entire section, from beginning to end, is found in Volume 11, Chapter 74 "Lun Ji Zhen Chi" (Discourse on Diagnosing Diseases by Observing the Forearms) of the *Ling Shu* (Spiritual Pivot). Furthermore, the passage from "Winter injury by cold" to "cough" is found in Volume 2, Chapter 5 "Yin Yang Ying Xiang Da Lun" (Great Treatise on Yin-Yang Correspondences) of the *Su Wen*, and also in Volume 11, Chapter 5 of the *Jia Yi Jing*.

The changes of the four seasons and the mutual overcoming of cold and summerheat follow the principle that extreme Yin transforms into Yang, and extreme Yang transforms into Yin. Therefore, Yin governs cold, and Yang governs heat; thus, extreme cold generates heat, and extreme heat generates cold. (At noon, when Yang Qi is at its peak, it must decline and transform into Yin; at midnight, when Yin Qi is at its extreme, it must rise and transform into Yang.) Hence it is said: Cold generates heat, and heat generates cold; this is the transformation of Yin and Yang. (In the eleventh lunar month, during extreme cold, the first Yang line begins to generate, illustrating how cold gives rise to heat. In the fifth lunar month, the first Yin line begins to generate, illustrating how heat gives rise to cold.) Hence it is said: Injury by cold in winter leads to Dan Re (intense heat) disease in spring; [Cold is the Qi of winter. 'Shang' implies excess. If humans suffer excessive cold exposure in winter, they will inevitably develop Dan Re disease in spring, demonstrating that cold generates heat.] Wind injury in spring leads to Sun Xie Chang Pi (diarrhea with undigested food and intestinal dysentery) in summer; [Wind is the Qi of spring. Excessive wind exposure leads to severe Sun Xie Chang Pi, demonstrating that wind generates diarrhea.] Summerheat injury in summer leads to Nue (Malaria/alternating chills and fever) in autumn; [Summerheat is the Qi of summer. Excessive summerheat exposure leads to severe Nue, demonstrating that summerheat generates malaria.] Dampness injury in autumn leads to cough in winter. [Dampness is the Qi of autumn. Excessive dampness exposure leads to severe cough, demonstrating that dampness generates cough.] This is referred to as the sequence of the four seasons. [This represents the inevitable order of the four seasons, which cannot be altered. [Ping An]: The original manuscript notes have the character "bi" (must) after "si shi" (four seasons), followed by three missing characters, with the bottom part of the last character resembling "wen." Yuan's printed edition lacks "bi" after "si shi" and reads "zhi xu zhi" (three characters), which does not fit the context. Here, following "bi," three spaces are left blank.]]