向东先见晓日。得初阳少火之气者。若当午向南。则壮火气衰。不用。（宗 ）
气味甘温。治下部疮。脱肛。止泄痢霍乱烦闷及温疟。昔一女忽嗜河泥。日食数碗。以壁
间败土调水饮之。遂愈。脾胃湿多。吐泻霍乱者。东壁土新汲水搅化。澄清服之。盖脾土喜
燥而恶湿。取太阳真火所照之土。引真火生发之气。补土而胜湿。则吐泻自止也。岭南方。
治瘴疟。香椿散内用南壁土。近治反胃呕吐用西壁土。或取离火所照之气。或取西方收敛之
气。皆不过借气补脾而已。（濒湖）下部生疮。湿气侵脾也。得阳气之壮。故能燥湿除疮。
脱肛亦大肠湿热所致。甘温而燥。故亦主之。其止泄痢霍乱烦闷者。甘能补脾胃。温能和中
也。又土得太阳初气。能祛暑湿之邪。故主温疟。（仲淳）肛门凸出。故屋东壁上土一升。
研末。以长皂荚挹末粉之。仍炙皂荚。更互熨之。
猝中暑热。搅土浆与服。即解。夏月 死。取十字道上热土。围脐旁。令人撒热尿于中。
仍用热土大蒜等分。捣汁去渣灌之。即活。
大寒。治发背诸恶疮。阴干为末。新水调敷。其痛立止。治疔肿。粪下土蝉蜕全蝎等分。
捣作钱大饼。香油煎滚。温服。以渣敷疮四围。疔自出。（圣济录）又法。以热粪盛核桃壳
内。覆疔肿上。根即烂出。（仲淳）
向东的墙壁先见到朝阳。因为得到了初升太阳少火之气，（所以有效）。如果是正午向南的墙壁，则壮火之气已衰，不使用。（李时珍引宗氏之说）
气味甘温。治疗下部疮疡、脱肛，止泄痢、霍乱烦闷以及温疟。从前有个女子突然嗜好食用河泥，每天吃几碗，用墙壁间陈旧的泥土调水饮用，病就痊愈了。对于脾胃湿气过多导致的呕吐、腹泻、霍乱患者，用东壁土与新汲的水搅拌溶解，澄清后服用。这是因为脾土喜欢干燥而厌恶潮湿，取被太阳真火照射过的土，引导真火生发之气，补益脾土以胜湿，那么吐泻自然停止。岭南地区的方法中，治疗瘴疟，在香椿散内使用南壁土。近期治疗反胃呕吐使用西壁土。或是取离火所照之气，或是取西方收敛之气，都不过是借气来补益脾脏罢了。（李时珍引濒湖之说）
下部生疮，是因为湿气侵袭脾脏。得到阳气的壮盛，所以能燥湿除疮。脱肛也是由大肠湿热所致，（东壁土）味甘性温且燥，所以也能主治。它之所以能止泄痢、霍乱和烦闷，是因为甘味能补益脾胃，温性能调和其中焦。另外，土得太阳初升之气，能祛除暑湿之邪，所以主治温疟。（陈实功引仲淳之说）
肛门凸出，取房屋东壁上的土一升，研成粉末，用长皂荚蘸取粉末扑撒患处，仍然炙烤皂荚，交替熨烫患处。
猝然中暑热，搅动土浆给患者服用，即可缓解。夏季中暑死亡者，取十字路口的热土，围绕肚脐旁放置，让人向其中撒热尿，仍然用热土和大蒜等分，捣汁去渣灌服，即可救活。
大寒证，治疗发背及各种恶疮，阴干后研成粉末，新水调敷，疼痛立即停止。治疗疔肿，取粪坑下的土、蝉蜕、全蝎等分，捣制成如铜钱大小的药饼，用香油煎滚，温服，并将药渣敷在疮疡四周，疔毒自会排出。（《圣济总录》）又一种方法，将热粪便盛放在核桃壳内，覆盖在疔肿上，疔根即腐烂排出。（陈实功引仲淳之说）
The earth from the east wall is exposed to the morning sun first. It obtains the qi of the "shao huo" (less fire/early warming energy) of the initial yang, and is therefore effective. Earth from a south-facing wall at noon possesses depleted "zhuang huo" (strong fire) energy and is not used. (Citing Zong)
It has a sweet flavor and warm nature. It treats sores in the lower body, rectal prolapse, stops dysentery, cholera-like vomiting and diarrhea with restlessness, and warm malaria. In the past, a woman suddenly developed a craving for river mud, consuming several bowls daily mixed with water using old soil from wall crevices, after which she recovered. For patients suffering from vomiting, diarrhea, and cholera due to excessive dampness in the spleen and stomach, stir new earth from the east wall into fresh drawn water, clarify it, and administer the liquid. This is because the spleen earth prefers dryness and dislikes dampness; taking earth illuminated by the true fire of the sun guides the generating qi of this true fire to tonify the spleen earth and overcome dampness, thereby naturally stopping vomiting and diarrhea. In methods from the Lingnan region, southern wall earth is used in the *Xiangchun San* (Toona Sinensis Powder) to treat miasma malaria. Recently, western wall earth is used to treat regurgitation and vomiting. Whether drawing upon the qi of the Li Fire (South) or the condensing qi of the West, the purpose is merely to borrow the qi to tonify the spleen. (Li Shizhen citing Benhu)
Sores in the lower body arise from dampness invading the spleen. Obtaining the strength of yang qi, it can dry dampness and eliminate sores. Rectal prolapse is also caused by damp-heat in the large intestine; its sweet, warm, and drying properties make it suitable for treating this condition. Its ability to stop dysentery, cholera, and restlessness stems from the sweet flavor tonifying the spleen and stomach, and the warm nature harmonizing the middle jiao. Furthermore, earth receiving the initial qi of the sun can dispel summerheat-dampness pathogens, thus treating warm malaria. (Chen Shigong citing Zhongchun)
For protruding anus, take one sheng of earth from the east wall of a house, grind it into powder, and apply it using long soap pods (*Gleditsia sinensis*) as an applicator. Continue by roasting the soap pod and alternating between applying powder and hot compresses.
In cases of sudden summerheat stroke, stirring earth slurry and administering it provides relief. For death-like collapse during summer, take hot earth from a crossroad, place it around the umbilicus, and have the patient urinate hot urine into it. Then, mix equal parts of this hot earth and garlic, crush to extract juice, remove dregs, and force-feed; life can be restored.
For severe cold conditions treating carbuncles on the back and various malignant sores, dry the earth in shade, grind into powder, mix with fresh water, and apply externally; pain stops immediately. To treat ding-sores (hard, deep-rooted boils), mix equal parts of earth from beneath manure pits, cicada sloughs, and full scorpions. Crush and form into cakes the size of a coin. Boil in sesame oil, consume warm, and apply the residue around the sore to facilitate the expulsion of the ding-toxin. (*Shengji Zonglu*) Another method: place hot manure inside walnut shells and cover the ding-sore; the root will rot and emerge. (Chen Shigong citing Zhongchun)