泻热、治目疾、涩止痢。
苦寒。色青性涩。以其除肝热而平木。故治目疾。（洗服皆效。）惊痫风湿诸痹。以其收
涩。
故治崩带下痢。苦寒清热。是其所长。纲目谓其久服轻身。益精有子。未必然也。出西土。
皮
不脱者真。今药客俱以此皮缚北细辛。大戟为使。恶吴茱萸。（赤
眼生翳、水煮秦皮一两、澄清、日日温洗。）
即臭椿根皮。涩肠燥湿。
苦燥湿。寒胜热。涩收敛。入血分而涩血。去肺胃之陈痰。治湿热为病。泄泻久痢。崩
带肠
风。梦遗滑精。有断下之功。（一妇年四十余、耽饮无度、多食鱼蟹、积毒在脏、日夜二三
十泻、便与脓血杂下、大肠连肛门甚痛、用止血痢药、不效、用肠风药益甚、盖肠风、有血
无脓也、服热药、腹愈痛、血愈下、服冷药、注泻食减、服温平药、则若不知、年余垂毙、
或教服人参散、樗皮人参各一两、为末、空心温酒或米饮下一钱、遂愈。）去疳 。苦寒之
性。虚寒者禁之。肾家真阴虚者。亦忌以其徒燥耳。痢疾积滞未尽者。勿遽用。勉强固涩。
必变他证。叶、功用相仿。差不及尔。
椿根白皮。（即香椿根皮。）主用相仿。力稍逊之。根东引者良。去粗皮。醋炙或蜜炙。
忌猪
肉、热面。止入丸散。不入汤煎。
Clears heat and purges fire, treats eye diseases, astringes to stop dysentery.
Bitter and cold in nature. Green in color and astringent in property. Because it eliminates liver heat and pacifies the Liver Wood (the Liver belongs to Wood), it is therefore used to treat eye diseases. (Effective whether taken internally or washed externally.) For fright convulsions, epilepsy, and various bi-syndromes caused by wind-dampness. Due to its astringent and consolidating properties.
Therefore, it treats metrorrhagia, leukorrhea, and dysentery. The bitter-cold nature clears heat, which is its strength. *Bencao Gangmu* states that long-term use lightens the body, benefits essence, and promotes fertility; this is not necessarily true. It originates from western regions.
The bark
that does not shed is authentic. Current drug merchants bind Northern *Asarum* (Beixixin) with this bark and use *Euphorbia* (Daji) as an adulterant. It is inimical to Evodia Fruit (Wuzhuyu). (For red eyes with corneal opacity: Decoct 1 liang of Qinpi in water, clarify, and wash daily with warm liquid.)
This is the root bark of the stink tree (*Ailanthus altissima*). It astringes the intestines and dries dampness.
Bitterness dries dampness, cold overcomes heat, and astringency consolidates. Enters the Blood level to astringe blood. Eliminates stale phlegm from the Lungs and Stomach. Treats diseases caused by damp-heat. Diarrhea, chronic dysentery, metrorrhagia, leukorrhea, intestinal wind. Nocturnal emission and seminal leakage. Possesses the function of stopping diarrhea and dysentery. (A woman over forty years old drank excessively without restraint and ate much fish and crab, accumulating toxins in the zang-fu organs. She suffered diarrhea twenty to thirty times day and night, with stool mixed with pus and blood, and severe pain in the large intestine extending to the anus. Medications for stopping bloody dysentery were ineffective; medications for intestinal wind made it worse. Generally, intestinal wind involves blood but no pus. Taking hot medicines increased abdominal pain and bleeding; taking cold medicines led to profuse diarrhea and reduced appetite; taking warm and neutral medicines had no effect. After nearly a year on the verge of death, someone advised her to take Renshen San. She took one qian of powdered Chupi Root Bark and Ginseng, taken on an empty stomach with warm wine or rice water, and was cured.) Eliminates childhood malnutrition syndrome (Gan). Due to its bitter-cold nature, it is contraindicated for deficiency-cold constitutions. Those with true yin deficiency of the Kidney must also avoid it, as it is too drying. For dysentery with residual stagnation, do not use hastily. Forcibly astringing will inevitably transform into other syndromes. The leaves have similar functions, though slightly inferior.
Chun Gen Bai Pi (Root Bark of Toon Tree). (Also known as the root bark of Xiangchun / Chinese Toon.) Main uses are similar, but potency is slightly weaker. Roots growing towards the east are superior. Remove the coarse outer bark. Process with vinegar or honey.
Contraindicated with pork and hot noodles. Only used in pills and powders, not in decoctions.