无毒。主难产，小儿痫。产妇临产时手持之，亦煮汁服一盏，此马勒口铁也。《本经
》马条注中，已略言之。（今附）
臣禹锡等谨按本经难产通用药云∶马衔，平。日华子云∶古旧铤者好，或作医士针也。
今据《本经》马条注中都无说马衔之事，不知此《经》所言何谓？今姑存云。
图经文具铁条下。
圣惠方∶治马喉痹，喉中深肿连颊，壮热吐气数者。用马衔一具，水三大盏，煎取一盏
半，
无毒。主破宿血，下石淋，除症结，伏鬼物恶气。一名磨石。烧赤热投酒中，饮之。
即今磨刀石，取 ，敷蠼 溺疮，有效。又不欲人蹋之，令人患带下，未知所由。又有越砥
石，极细，磨汁滴目，除障暗，烧赤投酒中，破血瘕痛。功状极同，名又相近，应是砺矣。
《禹贡》注云∶砥细于砺，皆磨石也。（新补 见陈藏器。）
味甘，温，无毒。酒渍服。主腰脚风冷，与殷孽同。一名乳花。
唐本注云∶三月、九月采之。乳水滴水上，散如霜雪者，出乳穴堂中。唐本先附臣禹锡
等谨
按日华子云∶石花，治腰膝及壮筋骨，助阳。此即洞中石乳滴下凝结者。
图经文具石钟乳条下。
衍义曰∶石花，白色，圆如覆大马杓，上有百十枝，每枝各槎牙，分歧如鹿角。上有细
纹起
，以指撩之，铮铮然有声。此石花也，多生海中石上，世亦难得，家中有一本，后又于大相
国宫中见一本，其体甚脆，不禁触击。本条所注皆非。
(Ma Xian) Non-toxic. Mainly treats difficult labor and pediatric epilepsy (Xian, convulsive disorder). When a parturient is in labor, she should hold this object; alternatively, it can be decocted in water and one cup of the liquid consumed. This is the iron bit used in a horse's bridle. In the annotations for the "Horse" section of *Shen Nong Ben Cao Jing* (*Ben Jing*), it has been briefly mentioned. (Added now)
Minister Yuxi et al. respectfully note according to the general medicines for difficult labor in *Ben Jing*: Ma Xian is neutral in nature. Ri Huazi states: Old iron bars are good; some resemble needles used by physicians. Currently, there is no mention of Ma Xian in the annotations for the "Horse" section of *Ben Jing*, so it is unclear what this text refers to. It is tentatively preserved here with reservations.
Detailed records are available under the entry for "Iron Bars" in *Tu Jing*.
*Shenghui Fang*: Treats equine laryngeal obstruction (Ma Hou Bi), characterized by deep swelling in the throat extending to the cheeks, high fever, and frequent panting. Use one piece of Ma Xian, add three large cups of water, and decoct until one and a half cups remain.
(Li Shi) Non-toxic. Mainly resolves old blood stasis, expels stones in strangury (Shi Lin), eliminates masses (Zheng Jie), and dispels evil qi associated with malevolent spirits. Also known as Mo Shi (Grinding Stone). When heated red-hot and thrown into wine, it may be drunk. This refers to the current whetstone. Its powder applied topically treats ulcers caused by earwig urine (Qu Chi Niao Chuang), which is effective. One should avoid stepping on it, as it may cause leukorrhea (Dai Xia) in humans, though the reason is unknown. There is also Yue Di Shi, which is extremely fine; its juice dripped into the eyes removes visual obscurations (Zhang An). When heated red-hot and thrown into wine, it breaks blood masses (Xue Jia) and pain. Its efficacy and characteristics are extremely similar, and its name is close, suggesting it belongs to the category of Li Shi. The annotation for *Yu Gong* states: Di is finer than Li; both are grinding stones. (Newly supplemented, see Chen Cangqi.)
(Shi Hua) Sweet in taste, warm in nature, non-toxic. Soaked in wine and consumed. Mainly treats wind-cold in the waist and legs, with effects similar to Yin Nie. Also known as Ru Hua.
*Tang Ben Zhu* states: Harvest in March and September. When milk-like fluid drips onto water, it scatters like frost and snow; this originates from the "Ru Xue Tang" (Milk Cave Hall). Added previously by Tang Ben. Minister Yuxi et al. respectfully note that Ri Huazi states: Shi Hua treats waist and knee conditions, strengthens sinews and bones, and aids yang. This refers to the concretion formed by the dripping of stalactite milk (Shi Ru) in caves.
Detailed records are available under the entry for "Shi Zhong Ru" (Stalactite) in *Tu Jing*.
*Yan Yi* states: Shi Hua is white, round like an inverted large ladle, with hundreds or dozens of branches upon it. Each branch is jagged and divergent, resembling deer antlers. Fine ridges rise on the surface; when brushed with a finger, it produces a ringing sound. This is Shi Hua, which mostly grows on rocks in the sea and is rare in the world. I possessed one specimen at home, and later saw another in the Great Xiangguo Temple in Kaifeng. Its structure is very brittle and cannot withstand touching or striking. The annotations in the original text are all incorrect.