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When the five grains consumed by humans enter the stomach, the jinye (body fluids) rise to transform into qi and blood, while the dregs descend to form feces. The original substance has already been transformed, leaving only an extremely bitter and greatly cold flavor. It enters the Foot-Yangming Meridian (the Stomach meridian). When there is excess heat in the Yangming channel, patients may climb high and sing, or discard their clothes and run; the bitter-cold nature can clear the heat of the Yangming channel, thus treating epidemic severe fever with manic running. Since all toxins must involve heat and acridity, the bitter-cold nature can eliminate this acrid-heat, thereby governing various fresh toxins. Fresh feces applied topically for one day can cause a dingzhong (carbuncle/furuncle) to rot at its root; this is because dingzhong is formed by the condensation of wind-fire toxic qi. Upon encountering the great cold and extreme bitter nature, the wind-fire dissipates, and the root naturally rots. Dried feces are used to treat black-crusted (heixie) hemotoxic pox, following the same principle.

Fenqing (Clear Feces Liquid), also known as Huanglong Tang (Yellow Dragon Decoction) or Jinzhi (Golden Juice), is obtained by cutting segments of Dendrocalamus strictus (Danzhu), scraping off the green skin, plugging the mouth, and inserting them into a latrine pit. After accumulating for many years, the resulting liquid is very dark. If buried deep underground for a long time, it becomes clear like spring water without any foul odor. It also treats epidemic mania, hemotoxic pox with zhong'e (sudden severe illness), mushroom toxins, malignant sores, plague-related dingzhong, and can treat hundred-toxin cases near death. Renzhonghuang (Human Middle Yellow) refers to the yellow substance formed on bricks and stones in latrines over many years, or artificially made Gancao (Licorice Root) soaked for a long time. It resolves heat-toxins in the Stomach and epidemic toxins with miraculous efficacy. There is also Diqing (Earth Clear), which can be prepared immediately, utilizing the sweet-cold nature of soil and water to specifically resolve severe Yangming fever with mania and thirst.

Renfen (Human Feces) treats epidemic severe fever with manic running and is good at resolving various toxins, dingzhong, and open-mouth conditions. Applying fresh feces for one day causes the root to rot. Fenqing, prepared according to ancient methods by burying feces deep underground for many years, treats seasonal mania and nourishes yin deficiency with dryness-heat. It can drive away all types of sores and resolve all kinds of toxins. Dried feces calcined to retain their properties (burned until carbonized but retaining medicinal effect) and ground into powder treat all heat-toxin pox; they can also be added for hemotoxic black-crusted pox. Diqing is prepared by selecting clean yellow earth in a shady place, digging a small pit, adding two or three spoons of fine dried feces powder, drawing fresh water, stirring, letting it settle, and drinking the clarified liquid. Do not consume too much; it also resolves severe fever and mania-thirst.

The preparation method for Renzhonghuang: Cut bamboo, scrape off the green skin, fill it tightly with Gancao (Licorice Root), seal it firmly with oil paste, throw it into a toilet on Lidong (Start of Winter), retrieve it after Lichun (Start of Spring), and dry it in the shade in a windy but sunless place for half a month. Split open to take out the Gancao, sun-dry it, and use it; it treats epidemic toxins with miraculous efficacy. Fresh infant feces can remove flesh eaten by sores and can also remove facial marks or tattoos.

Scooping up maggots from feces and washing them clean is a divine prescription for treating pediatric gan-zhang (malnutrition with abdominal distension). Ascaris lumbricoides (roundworms) found in feces have a greatly cold nature. Large worms should be washed, cut, and their juice extracted; dripping this juice into eyes suffering from chronic red-eye disease will cure it.

Main Indications (referencing *Douzhen He Can*): In the twelfth lunar month, select extremely dry adult feces from paths traveled eastward. Burn them with fire until the smoke ceases, grind them into fine powder, and ingest them. This primarily resolves various toxins and is excellent for treating black-depressed pox and epidemic severe fever with manic running.