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The chicken belongs to You Metal in the Five Elements and corresponds to the Xun (Wind/Wood) trigram in the Eight Trigrams, possessing both Metal and Wood qi characteristics. It inherently has the advantage of controlling Spleen Earth. Using its feces, specifically the white part formed from the transformation of water and grain, is particularly effective in resolving stagnation, eliminating accumulations, and guiding turbid qi downward. Therefore, when the function of Spleen Earth is restored, abdominal distension (Gu Zhang) subsides; when the Qi of Wind Wood is pacified, muscle twitching (Zhuan Jin) stops naturally. Its ability to promote urination and treat enuresis (Yi Ni) exists because enuresis is often accompanied by difficulty in urination. Using the white part of the feces is to take advantage of its greater acquisition of Metal qi; using non-white parts is also acceptable without strict adherence.

*Shenghui Fang* uses silkworm sand (Yuancan Sha) to treat convulsions caused by Huoluan (Cholera-like syndrome), which is derived from *Jishi Bai San*, also relying on the ability of silkworm sand to overcome wind and remove dampness, guiding turbidity downward.

Egg white represents Yang, while egg yolk represents Yin. The qi of egg white is light and ascending, while that of egg yolk is heavy and descending. Thus, egg white can dissipate floating Yang and treat eye heat, redness, pain, and sores in the throat. Egg yolk can nourish True Yin and primarily treats vexation in the heart with inability to sleep, as well as conditions following vomiting in Baihe Bing (Lily Disease), infantile heat sores, and fetal leakage during pregnancy.

The statement in *Ben Jing* ("Egg white stops diarrhea in children") deserves careful consideration. For pediatric heat-induced diarrhea, treating it with the clear, slightly cold nature of egg white alone is effective. For adults, bitter-cold herbs are more appropriate. Modern practitioners, unaware of the pattern where heat obstructs the collaterals, preventing water and grain from transforming into blood and causing them to rush directly to the Large Intestine, generally resort to bland-leaching or warm-drying methods. Reading this, one cannot help but feel bewildered.

In *Shanghan Lun*: "In Shaoyin disease, if there is diarrhea and a faint pulse, give Baitong Tang. If diarrhea persists, accompanied by cold limbs, absence of pulse, dry retching, and vexation, Baotong Jia Zhuyedan Tang should be used." This indicates that bile is added specifically for dry retching and vexation. These symptoms arise from the upward rushing of Shaoyang Wood Fire affecting the Heart and Stomach. If it were merely cold, there would be no vexation or dry retching. In Huoluan, if there is diarrhea with undigested food, interior cold with exterior heat, sweating, and cold limbs, Tongmai Sini Tang is indicated. If vomiting and diarrhea cease, yet sweating and cold limbs persist, along with unrelieved limb cramping/tetany and a faint pulse nearly imperceptible, Tongmai Sini Jia Zhuyedan Tang is indicated. The addition of "unrelieved" after "limb cramping" implies that previous treatments failed. By analogy with the case of Baotong Jia Zhuyedan Tang, the initial treatment was likely Tongmai Sini Tang. After administration, sweating and cold limbs remained, and new symptoms of unrelieved cramping and a faint pulse emerged. This does not necessarily indicate incorrect treatment. The limbs are the root of all Yang meridians. When Yin pathogens fill the limbs, Yang is bound by Yin and cannot extend. Administering hot herbs like Ginger and Aconite causes Yang to be rejected internally and Yin to contend externally, making it impossible to resolve cramping. Cramping is the contraction of sinews, which belong to the Liver. Since Liver and Gallbladder are interior-exterior pairs, the intolerance to the heat of Ginger and Aconite is due to the Gallbladder. If Ministerial Fire (Xianghuo) is unchecked, how can Sovereign Fire (Junhuo) be regulated? Hence, sometimes presenting as retching/vexation, sometimes as cramping, this is why Pig Bile is added. Pig bile is bitter and cold; applied to failing Yang, how can it be tolerated? The principle is that the fire within Yin becomes agitated and seeks resolution, which only bile can pacify. Thus, "following the nature" (Congzhi) is effectively "correct treatment" (Zhengzhi). However, Zhang Zhongjing's use of this method was extremely cautious. In Shaoyin cold pathogen direct invasion, Yang qi is suddenly deficient but not fundamentally weak, and Primordial Yang resides within. Thus, when diarrhea is accompanied by retching and vexation, bile can be added. In Huoluan, with simultaneous vomiting and diarrhea, the Middle Qi is scattered, making bile contraindicated. It is only added when cramping is unrelieved and vomiting/diarrhea have ceased. "Unrelieved" means "as before." Why did Zhongjing not use it immediately at the onset of cramping? This can be inferred from other cases. In Guizhi Jia Fuzi Tang, "slight cramping" is mentioned; in Sini Tang, "internal cramping" and "limb cramping"; in Shaoyao Gancao Tang, "slight cramping"—none used bile. Only severe, unrelieved cramping warrants its use, showing caution against its bitter-cold nature damaging healthy Qi. Zhang Yinan claimed bile stimulates Kidney fluids and assists Heart Blood. If true, Zhongjing would have used it more frequently. Why such a lack of scrutiny?

The Gallbladder is located within the Liver lobes, and diseases often co-occur, leading physicians to conflate them. Often, focus is placed solely on the Liver, discussing Liver Qi or Liver Yang, rarely distinguishing Gallbladder disease. However, the Liver is a Yin meridian, while the Gallbladder is a Yang meridian; the Liver corresponds to Wind-Wood, and the Gallbladder to Ministerial Fire. In any condition involving rising or fire, the Liver invariably involves the Gallbladder, or it may even be primarily a Gallbladder disorder. Li Binhu stated that Pig Bile removes Liver-Gallbladder fire, aligning with my view of "conforming treatment as correct treatment," though he grouped them together. Cheng Wuji argued that adding bile to Tongmai Sini Tang tonifies the Liver and harmonizes Yin, mentioning only the Liver. Comparing the two, Li is superior. Liu Qianjiang, however, praised Cheng and criticized Li, stating: "I saw a physician treat intermittent diarrhea using Pinellia-bile fried Coptis and Bupleurum; it worked. Without bile, it failed. If not to tonify the Liver and calm wind, but merely to clear fire as Li Shizhen said, why would Coptis fail?" Liu is profoundly mistaken! When bile is used with Ginger and Aconite, claiming it treats Gallbladder fire directly, people may doubt it. But when paired with Bupleurum and Coptis, removing bile renders it ineffective, proving its efficacy. Why? Bile is bitter, cold, and slippery, promoting bowel movements. If it were purely Liver purgation, adding bile should worsen diarrhea. Yet, without bile, diarrhea persists. This confirms Liver disease involving the Gallbladder. Treating the Liver with Coptis uses cold to overcome heat and bitterness to dry dampness. Treating the Gallbladder with bile pacifies excessive fire to support vital Qi, preventing it from descending with the Liver. Treating only the Liver fails. Moreover, Bupleurum is a Shaoyang herb, clearly assisting in restoring Shaoyang Qi. Cheng’s theory is baseless, and Liu’s endorsement is misguided. Medicine is indeed difficult to discuss.