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The previous discussion was abbreviated in sequence, and there is one additional syndrome; essentially, although the Six Channels are divided into six, upon examination, they amount to only four. Hua Tuo stated that on the first, second, and third days, the pathogen is in the skin and muscles; Zhang Zhongjing subsumes this under the Taiyang Channel (Taiyang Channel). On the fourth day, the pathogen is in the chest, subsumed under the Shaoyang Channel (Shaoyang Channel); on the sixth day, it is in the stomach, subsumed under the Yangming Channel (Yangming Channel); on the fifth day, it is in the abdomen, which Zhang Zhongjing divides into three channels: the Taiyin Channel (Taiyin Channel), Shaoyin Channel (Shaoyin Channel), and Jueyin Channel (Jueyin Channel). Thus, although both Hua Tuo and Zhang Zhongjing divide them into six, they each effectively merge into four! Therefore, in Zhang Zhongjing's discussion of the times when each channel resolves (the periods when symptoms alleviate), the Taiyang Channel corresponds to the Si, Wu, and Wei hours; the Yangming Channel to the Shen, You, and Xu hours; the Shaoyang Channel to the Yin, Mao, and Chen hours; and the Three Yin Channels primarily around the Hai, Zi, and Chou hours, with some intermixing. In reality, within the twelve two-hour periods, only three are utilized. This is largely consistent with the *Ling Shu: Wei Qi Xing* chapter, which states that after one water drop falls, the vital qi is in the Taiyang Channel; after two drops, in the Shaoyang Channel; after three drops, in the Yangming Channel; and after four drops, in the Yin Division. The Yin Division refers to the distribution of the Three Yin Channels. The principle of the waxing and waning of Yin and Yang likely originates from this. Furthermore, in Zhang Zhongjing's writings, the Wind Stroke affecting the Three Yang Channels all have specific syndromes described. Only for the Three Yin Channels does the Taiyin Channel mention a single syndrome of painful discomfort in the four limbs, while the Shaoyin and Jueyin Channels only discuss pulses without describing syndromes. This clearly indicates that one statement in the Taiyin Chapter can encompass the other two channels, so those two chapters were abbreviated for brevity. Extending from Wind Stroke to Cold Damage, what is said at the beginning of the Taiyin Chapter regarding abdominal fullness and vomiting food likely also encompasses both channels. However, if accompanied by drowsiness, it belongs to the Shaoyin Channel; if accompanied by thirst, heat, pain, and hunger sensations, it belongs to the Jueyin Channel. All should take abdominal fullness and vomiting as the root. Otherwise, merely having drowsiness is hardly sufficient to definitively diagnose it as a Shaoyin Cold Damage disease? Moreover, the Shaoyin Chapter details vomiting, diarrhea, and abdominal pain. If we compare this to how the Yangming and Shaoyang Chapters do not detail Taiyang syndrome examples, would it not be vastly different? Additionally, the Three Yang Chapters detail the transmission of diseases between channels, as well as syndromes of Bing Bing (simultaneous involvement of two channels) and He Bing (simultaneous involvement of three channels). Yet, for the Three Yin Channels, it is brief, lacking syndromes of Bing Bing or He Bing involving Taiyin and Shaoyin, or Taiyin and Jueyin, let alone He Bing of all Three Yin or Bing Bing of any Two Yin. Is this not manifestly clear!

Pathogens invading the human body follow specific rules. In the躯壳 (body exterior), wind damages the skin and pores, dampness flows into the joints, cold injures the sinews and bones, and heat harms the blood vessels; in the Zang-Fu organs, wind damages the Liver, dampness damages the Kidney, cold damages the Lung, and heat damages the Heart. Both cases follow the principle of similarity. If pathogens do not follow similarity, it must be due to transmission between the interior and exterior. The general rule is that pathogens in the exterior transmit via the Six Channels and resolve by the seventh day; pathogens in the Zang organs transmit via the Five Zang and resolve by the sixth day. The Six Channels are Yang, and the Five Zang are Yin. Transmission between interior and exterior does not fall under this example. Therefore, in Zhang Zhongjing's book, when discussing aversion to cold, it often begins with fever or absence of fever, following the example of the Taiyang Chapter. In the general discussion, however, based on Hua Tuo's theory of six days and six layers, he uses the names of the Six Channels to embellish the text, likely conflating channels and Zang organs in a cross-cutting manner, thereby forming his own unique theory. Thus, in the Yangming Chapter, "Wei Jia Shi" (Stomach Family Excess/Interior Excess) is taken as the primary focus, while the external syndromes of the Yangming Channel are temporarily retained for illustrative purposes. Any section headed by the three characters "Yangming Disease" refers specifically to Wei Jia Shi, which differs from the description of the Yangming Channel as the meridian running along the front of the body in the *Su Wen* and *Ling Shu*. The reason for this is that pharmacological treatment methods differ from acupuncture methods. When reading Zhang Zhongjing's book, do not cling to theories from other channels to doubt this discussion, nor cling to this discussion to doubt other channels. At the beginning of other chapters, the text lists disease names individually, but "Wei Jia Shi" is mentioned vaguely to show that the Stomach is where all things return and no longer transmits elsewhere; because its domain is broad, it cannot be referred to simply as one or two parts. Careful reading will reveal this. The *Qian Jin Fang* writes "Wei Jia Han" (Stomach Family Cold); "Han" (Cold) is a miswriting of "Sai" (Obstruction/Blockage), which has the same meaning as "Shi" (Excess/Fullness). In the *Jin Gui Yao Lue*, regarding jaundice, it mentions "Yin being affected by its cold," and the *Qian Jin Fang* also writes "Sai," which serves as proof. How can people see the difference in the single character "Han" and then make excuses for it!