三尺以上曰粪。三尺以下曰土。凡用当去其恶物。勿令入客水。（藏器）
气味甘平。主治泄痢冷热赤白。腹内热毒绞结痛。下血。（取干土。水煮三五沸。绞去
滓。暖服一二升。）又解诸药毒。中肉毒。合口椒毒。野菌毒。宋皇子病螈 。（拘急为螈。
张纵为 。俗谓之搐。）钱仲阳进黄土汤而愈。神宗问疾愈之故。对曰。以土胜水。水得其
平。则风自退耳。（钱乙传） 吴少师因夏月出师燥渴。饮涧水一杯。似有物入咽。遂得疾。
数月消瘦。每饮食入咽。如万虫攒攻。且痒且痛。张鸡峰（名锐。着有备急方。）诊之。令
明旦勿食。取行路黄土。入温酒二升搅之。投药百粒饮之。觉痛几不堪。及登溷。下马蝗千
余。半已困死。吴亦惫甚。调理三日乃安。此证虫入人脏。势必孳生。饥则聚咂精血。饱则
散处脏腑。苟知杀之而不能扫取。终无益也。今枵腹以诱之。投其所喜。俾之乘饥毕集。一
洗而空之。诚善术也。（夷坚志） 小儿乌痧惊风。遍身都乌者。急推向下。将黄土一碗。
捣末。入久醋一钟。炒热包定熨之。引下至足。刺破为妙。肉痔肿痛。朝阳黄土黄连末皮硝
各一两。用猪胆汁同研如泥。每日旋丸枣大。纳入肛内。过一夜。随大便去之。内服乌梅黄
连二味丸药。
Above three chi is called feces. Below three chi is called earth. When using earth as medicine, one must remove its impurities and prevent the intrusion of "ke shui" (external mixed water). (Chen Cangqi)
The flavor is sweet and the nature is neutral. It treats cold-heat dysentery, red-and-white dysentery, and abdominal pain caused by heat-toxin knotting, as well as hematochezia. (Take dry earth, boil in water for three to five boils, filter out the dregs, and take warm, one to two sheng.) It also resolves various drug poisonings, meat toxins, *He Kou Jiao* (a type of toxic pepper) poisoning, and wild mushroom poisoning. The prince of the Song Dynasty suffered from convulsions. ("Yong" refers to limb stiffness and spasms; Zhang Zong referred to it as " ", commonly known as twitching or convulsion.) Qian Yi prescribed *Huang Tu Tang* (Yellow Earth Decoction), which cured the condition. Emperor Shenzong asked about the reason for the cure. Qian Yi replied, "Earth overcomes Water. When Water becomes balanced, Wind naturally subsides." (From *Biography of Qian Yi*)
Wu Shaoshi, while leading troops in summer, felt extreme thirst and drank a cup of stream water. He felt as if something had entered his throat, subsequently falling ill. After several months, he wasted away. Every time food and drink passed down his throat, he felt as if ten thousand insects were swarming and attacking, causing both itching and pain. Zhang Jimfeng (Zhang Rui, author of *Beiji Fang*) diagnosed the case and instructed him not to eat on the following morning. He took yellow earth from where people walked, stirred it into two sheng of warm wine, and administered it along with one hundred pills. The patient felt unbearable pain. Upon defecating, he expelled over a thousand horse-leeches, half of which were already dead. Wu Shaoshi was extremely exhausted but stabilized after three days of recuperation. This condition involves parasites entering the internal organs, where they inevitably breed. When hungry, they gather to suck essence and blood; when full, they scatter throughout the viscera. Merely knowing how to kill them without clearing them out is ultimately useless. By inducing fasting now, we lure the parasites, satisfying their preference so they gather due to hunger, and then wash them all out at once. This is indeed a skillful method. (From *Yijian Zhi*)
For pediatric *Wu Sha Jing Feng* (Black Miasma Convulsive Disease) presenting with blackening of the entire body, rapidly push downwards. Take one bowl of yellow earth, grind it into powder, add one zhong of aged vinegar, stir-fry until hot, wrap in cloth, and apply as a compress to guide the pathogen downwards to the feet. Pricking the skin to release blood is advisable. For painful and swollen flesh hemorrhoids, use yellow earth from the morning sun, *Huang Lian* (Coptidis Rhizoma) powder, and *Pi Xiao* (Natrii Sulfas) each in an amount of one liang. Grind them together with pig bile (*Suis Fel*) into a paste. Form pills the size of a jujube daily and insert them into the anus. Remove them after one night along with the stool. Internally administer pills composed of *Wu Mei* (Mume Fructus) and *Huang Lian* (Coptidis Rhizoma).