主下部疮，脱肛。
陶隐居云∶此屋之东壁上土尔，当取东壁之东边，谓常先见日光，刮取用之。亦疗小儿
风脐
，又可除油污衣，胜锻石、滑石。唐本注云∶此土摩干、湿二癣，极有效也。臣禹锡等谨按
药性论云∶东壁土，亦或单用。性平。刮末细筛，点目中去翳。又东壁土一蚬壳细末，敷豌
豆疮及主温疟。日华子云∶东壁土，温，无毒。陈藏器云∶好土，味甘，平，无毒。主泄痢
，冷热赤白，腹内热毒绞结痛，下血。取入地干土，以水煮三、五沸，绞去滓，适稀稠，及
暖服二升。又解诸药毒，中肉毒、合口椒毒、野菌毒并解之。取东壁土用之，功亦小同。止
泄痢，霍乱烦闷为要。取其向阳壁久干也。张司空云∶土三尺以上曰粪，三尺以下曰土。服
之当去上恶物，勿令入客水。又食牛马肉及肝中毒者，先锉头发，令寸长，拌好土，作溏泥
二升，合和饮之，须臾发皆贯所食肝出。牛马独肝者有大毒，不可食。汉武云∶文成食马肝
死。又人卒患心痛，画地作五字，以撮取中央土，水和一升绞，服之良也。又云土消，大寒
，无毒。主伤寒时气，黄胆病，烦热，汤淋取汁顿服之。《庄子》云∶ 蜣转丸是也。藏在
土中，掘地得之，正圆如人捻作，弥久者佳。又云土槟榔，主恶疮，诸虫咬及瘰 ，疥 等
，细研油涂之，状如槟榔，于土穴中及阶除间得之。新者犹软，云蟾蜍屎也。蟾食百虫，故
特主恶疮。
图经文具锻石条下。
外台秘要∶治肛门凸出，故东壁土一升研，皂荚三挺长一尺二寸，壁土挹粉肛门。其头
出处，
取皂荚炙暖更递熨之，瘥。肘后方∶服药过剂及中毒，烦闷欲死。刮东壁土以水一、二升，
调
饮之。经验方∶治背痈疖。以多年烟熏壁土并黄柏二件等捣罗末，用生姜汁拌成膏，摊贴之
，
更以茅香汤调下一钱匕，服，妙也。子母秘录治小儿脐风疮，历年不瘥方∶东壁土敷之。
衍义东壁土文具伏龙肝条下。
主治下部疮疡，脱肛。
陶弘景说：这是房屋东墙壁上的土，应当选取东壁的最东侧，即常年最先见到阳光的地方，刮取使用。也能治疗小儿风脐（小儿脐风），还可以去除衣服上的油污，效果胜过锻石、滑石。《新修本草》注解说：这种土摩擦干燥或湿润的癣症，非常有效。臣禹锡等人考证《药性论》说：东壁土也可以单独使用。药性平和。刮成细末过筛，点入眼中以去除翳膜。另外用一蚬壳盛装的东壁土细末，外敷治疗豌豆疮（天花）及主治温疟。日华子说：东壁土，性温，无毒。陈藏器说：优质的土，味甘，性平，无毒。主治泄痢（腹泻和痢疾），冷热赤白痢，腹内热毒绞结疼痛，便血。取深入地下的干土，用水煮三到五沸，过滤去渣，调节至适宜的稀稠度，趁热服用二升。又能解各种药物中毒，肉毒、合口椒毒、野菌毒都能解除。取东壁土使用，功效也大致相同。止住泄痢，缓解霍乱引起的烦闷是其主要作用。要选取向阳墙壁长久干燥的土。张司空说：地表三尺以上称为粪，三尺以下称为土。服用它应当排出上部的恶物，不要让污物进入客水（指非正常的体液或病理产物）。又有人食用牛马肉及肝脏中毒者，先剪短头发至一寸长，拌入好土，制成两升稀泥，混合饮用，片刻后头发都会随着所食的有毒肝脏排出。牛马的独肝有大毒，不可食用。汉武帝说：文成公吃马肝而死。又有人突然患心痛，在地上画五个字，撮取中央的土，加水一升绞汁，服用效果良好。又说土消（一种矿物药），大寒，无毒。主治伤寒时气，黄疸病，烦热，用热水淋取汁液顿服。《庄子》说：蜣螂转丸就是这种东西。藏在土中，掘地可得，形状正圆如人捏制，存放越久越好。又说土槟榔，主治恶疮，各种虫咬及瘰疬（颈部淋巴结结核）、疥癣等，细细研磨后用油调涂，形状像槟榔，在土穴中和台阶间得到。新的还软，说是蟾蜍屎。蟾蜍吃百虫，所以特别擅长治疗恶疮。
《图经本草》在锻石条目下已有详细记载。
《外台秘要》：治疗肛门凸出，故将东壁土一升研细，皂荚三挺长一尺二寸，用壁土粉扑肛门。对于肛门突出的头部，取炙热的皂荚交替熨烫，即可痊愈。《肘后备急方》：服药过量及中毒，烦闷欲死。刮取东壁土，用水一、二升，调和饮用。经验方：治疗背痈疖。用多年烟熏的壁土和黄柏各等份捣罗成末，用生姜汁拌成膏，摊贴患处，再用茅香汤送下一钱匕药粉，服用，效果奇妙。《子母秘录》治疗小儿脐风疮，历年不愈的方子：用东壁土外敷。
《衍义》在东壁土条目下参照伏龙肝条目。
Indicated for sores in the lower body and rectal prolapse.
Tao Hongjing stated: This is the earth from the east wall of a house; one should take the easternmost part of the east wall, where sunlight falls first, and scrape it for use. It can also treat infant wind-umbilicus (infantile tetanus involving the umbilicus), and can remove oil stains from clothes, being superior to calcined alum and talcum powder. The *Xinxiu Bencao* notes: Rubbing this earth on dry or moist tinea is extremely effective. Ministers Yu Xi et al. verified in the *Yaoxing Lun*: Dongbi Tu (East Wall Earth) can also be used alone. Its nature is neutral. Scrape into fine powder, sift, and apply to the eyes to remove nebulae. Additionally, one shell's worth of finely powdered Dongbi Tu applied externally treats variola (smallpox) and is indicated for warm malaria. Ri Huazi stated: Dongbi Tu is warm and non-toxic. Chen Zangqi stated: Good quality earth has a sweet taste, is neutral, and non-toxic. It indicates for diarrhea and dysentery, cold-heat red-and-white dysentery, heat-toxin knotting pain in the abdomen, and bloody stool. Take dry earth from deep underground, boil in water for three to five boils, filter off the dregs, adjust to appropriate thickness, and drink two sheng while warm. It can also resolve various drug poisonings, including meat poison, pepper poison, and wild mushroom poison. Using Dongbi Tu yields similar efficacy. Its primary function is to stop diarrhea and dysentery and relieve the restlessness of cholera. One should select earth from sun-facing walls that has been dried for a long time. Zhang Sikong stated: Earth above three chi is called manure; below three chi is called earth. Ingesting it helps expel upper malignant substances; do not allow dirty water to enter. For those poisoned by eating beef, horse meat, or their livers, first cut hair to one cun length, mix with good earth to make two sheng of thick mud, mix and drink; soon all hair will emerge along with the ingested toxic liver. The solitary liver of cattle and horses contains severe poison and must not be eaten. Emperor Wu of Han stated: Wencheng died after eating horse liver. Also, for sudden onset of heart pain, draw five characters on the ground, scoop up the central earth, mix with one sheng of water, squeeze out the juice, and ingest for good effect. It is also said that Tuxiao (a mineral drug) is very cold, non-toxic, and indicates for cold damage and seasonal epidemics, jaundice, and irritability/heat; pour boiling water over it to extract the juice and ingest at once. The *Zhuangzi* states: The pellets rolled by dung beetles are this substance. Hidden in the soil, dug up from the ground, perfectly round as if molded by human hands; the older, the better. It is also said that Tubinglang (Earth Areca Nut) indicates for malignant sores, insect bites, scrofula, and scabies; grind finely and apply with oil. It resembles an areca nut and is found in earth holes and between steps. Fresh ones are still soft, said to be toad excrement. Since toads eat hundreds of insects, they are particularly effective for malignant sores.
The *Tujing Bencao* details are under the entry for Calcined Alum.
The *Waitai Miyao*: To treat protruding anus, grind one sheng of Dongbi Tu finely; take three stalks of Gleditsia sinensis (Chinese Honeylocust Fruit), each one chi two cun long; use the wall earth powder to dust the anus. For the protruding head, apply heated Gleditsia sinensis alternately with moxibustion/warming until healed. The *Zhouhou Beiji Fang*: For overdose of medication and poisoning, causing extreme restlessness and near-death sensation. Scrape Dongbi Tu, mix with one or two sheng of water, stir and drink. Empirical Formula: To treat back carbuncles and furuncles. Use Dongbi Tu exposed to smoke for many years and Phellodendri Cortex (Huangbai) in equal parts, pound and sieve into powder; mix with ginger juice to form a paste, spread and apply. Additionally, swallow one qian bi of powder mixed with Mugwort fragrans (Maoxiang) decoction; the effect is wonderful. The *Zimu Milu* formula for treating infant umbilical wind sores that have not healed for years: Apply Dongbi Tu externally.
The *Yanyi* refers to the entry for Longgu Feigan (Dragon's Liver) for Dongbi Tu.