无毒
马衔主难产小儿痫产妇临产时手持之亦煮汁服一盏（名医所录）【地】（图经曰）马衔即
马
勒口铁也处处有之古旧铤者堪作医家针用○谨按铁体坚重其性镇坠故有治痫之功马乃行地无
疆则顺而健矣夫欲驰者必藉勒以先之故用催生亦取其健顺之义尔【色】黑【味】微咸【性】
平【气】味浓于气阴中之阳【臭】腥【主】妇人难产小儿惊痫【制】煮汁用【治】（疗）（别
录云）
无毒附盐精 卤地生
太阴玄精主除风冷邪气湿痹益精气妇人痼冷漏下心腹积聚冷气止头疼解肌（名医所录）
【地】（图经曰）出解县解池及通泰州积盐仓中亦有之其色青白如龟背者佳盖禀阴数而成故
有
六出因名太阴玄精也近地亦有色赤青白大片者次之沈存中云大卤之地即生阴精石是也解池一
种盐精无毒味更咸苦青黑色大者三二寸形似铁铧嘴三月四月采亦主除风冷又名泥精盖玄精之
类也古方不见用者近世补药及治伤寒多用之【时】（生）无时（采）无时【用】龟背者为好
【质】
类井泉石【色】青白【味】微咸【性】温软【气】味浓气薄阴中之阳【臭】朽【主】益精气
消积聚【制】研细用【合治】合硝石硫黄各二两 砂一两细研入瓷瓶中固济以火半斤于瓶子
周一寸胁之约半日候药青紫色住火待冷取出用腊月雪水拌令匀湿入瓷罐中放屋后北阴下阴干
又入地埋二七日取出细研以面糊和丸如鸡头实大先用热水浴后以艾汤研下一丸以衣盖出汗名
正阳丹瘵伤寒三日头痛壮热四肢不利
无毒。
马衔主治难产、小儿惊痫。产妇在临产时手持此物，也可以煎煮汁液服用一盏（据名医记录）。【产地】（《图经》记载）马衔即马勒口中的铁器，各地都有。古旧的铁锭可以用作医家的针具。○谨按：铁体质地坚硬沉重，其性质具有镇坠作用，因此有治疗惊痫的功效。马是行于大地、疆域无边的动物，所以顺应地势且强健。想要奔驰的人必须依靠缰绳来引导，因此使用马衔催产也是取其“健顺”的含义。【颜色】黑。【味道】微咸。【性质】平。【气味】味浓于气，属于阴中之阳。【气味特征】腥。【主治】妇人难产、小儿惊痫。【炮制方法】煎煮汁液使用。【疗效】（《别录》记载）
无毒。附生于盐卤之地。
太阴玄精主治祛除风冷邪气、湿痹，补益精气，治疗妇人久治不愈的虚寒证、带下漏血、心腹积聚冷气，止头痛，解肌表之邪（据名医记录）。【产地】（《图经》记载）出产于解县解池以及通泰州积盐仓中也有。其中颜色青白如龟背纹者为佳，大概是因为禀受阴数而成，所以有六出花纹，因此命名为太阴玄精。靠近地面的也有颜色赤红或青白的大片矿石，品质稍次。沈存中说，大卤之地即生长阴精石，这就是解池的一种盐精，无毒，味道更偏咸苦，呈青黑色，大的有三二寸长，形状像铁铧嘴，三月四月采收，也主治祛除风冷，又名泥精，大概是玄精的一类。古方中不见使用，近世补药及治疗伤寒多用之。【时令】（生长）无固定时间。（采收）无固定时间。【用法】以龟背纹者为好。【质地】类似井泉石。【颜色】青白。【味道】微咸。【性质】温软。【气味】味浓气薄，属于阴中之阳。【气味特征】朽味。【主治】补益精气，消除积聚。【炮制方法】研成细末使用。【配伍治疗】与硝石、硫黄各二两，砂一两，一起研细，放入瓷瓶中密封，用半斤火在瓶子周围烘烤约半天，待药呈现青紫色时停止加热，冷却后取出。用腊月雪水拌令均匀湿润，放入瓷罐中，放置在屋后北面的阴凉处阴干。又埋入地下二十七天，取出研细，用面糊和丸，如鸡头实大小。先用热水浴身，然后用艾汤研磨一丸服用，盖衣出汗，名为正阳丹。用于伤寒三日，头痛壮热，四肢不利。
Non-toxic.
Ma Xian (Horse Bit, a type of iron) treats difficult labor and infantile convulsions. During childbirth, the mother may hold this object in her hand; alternatively, it can be boiled to make a decoction, one cup of which is taken orally (Recorded by famous physicians). [Origin] (According to *Tu Jing*): Ma Xian refers to the iron bit used in horse bridles, available everywhere. Old iron ingots can be used by medical practitioners as needles. ○ Careful analysis: Iron is hard and heavy in texture, and its nature is sedative and downward-draining; thus, it has the efficacy of treating convulsions. Horses traverse vast lands, moving in accordance with the earth and possessing robust vitality. To gallop, one must rely on the bridle for guidance; therefore, using Ma Xian to induce labor also derives from the meaning of "robustness and compliance." [Color] Black. [Taste] Slightly salty. [Nature] Neutral. [Qi and Taste] The taste is stronger than the qi; belongs to Yin within Yang. [Odor] Fishy. [Indications] Difficult labor in women, infantile convulsions. [Preparation] Boil to extract juice. [Efficacy] (According to *Bie Lu*):
Non-toxic. Grows in saline-alkali soil.
Taiyin Xuanjing (Dark Essence of Great Yin) treats the expulsion of wind-cold pathogenic factors, damp-bi syndrome, tonification of essence and qi, treatment of chronic cold syndromes in women, leukorrhea, accumulation of cold qi in the heart and abdomen, relief of headaches, and release of the muscle layer (Recorded by famous physicians). [Origin] (According to *Tu Jing*): Produced in Jiexian Jiexi Pool, and also found in the salt storage warehouses of Tongzhou Prefecture. Those with a blue-white color resembling turtle shell patterns are considered superior, likely because they are formed according to Yin numbers, possessing six-pointed crystalline structures, hence named Taiyin Xuanjing. Closer to the ground, there are large sheets of red or blue-white ore, which are of secondary quality. Shen Cunzhong stated that dark saline lands produce Yinjingshi (Yin Essence Stone), which is a type of salt essence from Jiexi Pool. It is non-toxic, tastes more salty and bitter, appears blue-black, measures three to two inches in length, resembles the mouth of an iron plowshare, and is harvested in March and April. It also treats the expulsion of wind-cold. Also known as Nijing (Mud Essence), it is likely a category of Xuanjing. It was not seen in ancient prescriptions but is frequently used in modern times for tonic medicines and the treatment of Shanghan (Cold Damage). [Timing] (Growth) No specific time. (Harvesting) No specific time. [Usage] Turtle-shell patterned ones are preferred. [Texture] Similar to Jingquanshi (Well Spring Stone). [Color] Blue-white. [Taste] Slightly salty. [Nature] Warm and soft. [Qi and Taste] Taste is strong, Qi is weak; belongs to Yin within Yang. [Odor] Rotten/Old. [Indications] Tonifies essence and qi, eliminates accumulations. [Preparation] Grind into fine powder. [Compound Treatment]: Mix Xiao Shi (Niter), Liu Huang (Sulfur), each 2 liang, and Sha (Sand) 1 liang. Grind finely, place in a porcelain bottle, seal tightly, and heat around the bottle with half a jin of fire for about half a day. When the medicine turns blue-purple, stop heating. After cooling, remove. Mix evenly with snow water collected in the twelfth lunar month until moist. Place in a porcelain jar and dry in the shade under the north side of the house. Then bury in the ground for twenty-seven days, take out, grind finely, and mix with wheat paste to form pills the size of chicken heads. First, take a hot bath, then dissolve one pill in Ai Tang (Mugwort Decoction) and ingest. Cover with clothing to induce sweating. This is named Zhengyang Dan (True Yang Pill). Used for Shanghan on the third day, presenting with headache, high fever, and stiffness/weakness of the four limbs.