忆昔癸未秋，余在燕都，其时疫病大作。患者胸腹稍满，生白毛如羊，日死人数千，竟不知所名。有海昌明经李
君见之，曰∶“此痧也。”挑之以针，血出，病随手愈。于是城中舁而就医者，亦日以千计，皆得愈而去。顷之，症变
而为嗽，嗽甚轻，不半日随毙。时李君已出都。有知者曰∶“此亦痧也。”用前法挑之，亦随愈焉。余时目击其事，归而
与知医者言之，卒疑信交半，无何，则吾乡挑痧之法盛行矣。先是乡人有粪秽感痧，利用钱物蘸油而刮，及此多用
挑。然行之大都妇人，以故为名医者不道，及考诸医书，古时未有论及，后人稍有青筋之说，仍略而不详，因而求人之
信者少，疑者益多。用药之方，遂置之不论。人不幸犯是症，无得全者。噫！是可悯也。友人右陶郭君明理读书，旁
搜医学，见近之患痧者日益众，而治瘀者不闻，乃精心殚思，推原于小儿痧疹之理，兼求之古方，多有不言痧而见痧
之意者，且验之诸所救疗，无或爽，因以自信。遂发愿广之天下后世，为百千万人命之救，着有《玉衡》一书。右陶之
心切矣，右陶之功大矣！右陶尝言∶“痧本无定脉，凡脉与所患之症不相应者，即为痧之脉；痧亦无定症，或感风、感
食、感劳、感痰，而以本症治之不效者，皆为痧之症”。为立之方，使知遵也，为记之验，使知信也，后以药性终之，
使知用之有宜不宜，不与它症同也。右陶治痧之法，于是书乎全，而世人将读其书以治痧，兼以治右陶之所不及治。右
陶之心，于是大快。虽不欲居其功，功又安归哉！余既见痧之事，又信右陶之说，敢为之言，虽然不足为愚者道也。
时康熙十四年乙卯重阳日里人王庭题
回想过去癸未年秋天，我在燕京（北京），当时疫病大规模爆发。患者胸部和腹部轻微胀满，舌头上生出像羊毛一样的白色苔垢，每天死亡人数达数千，竟然不知道这是什么病。海昌的举人李君看到了这种情况，说：“这是痧症。”用针挑刺治疗，放出瘀血，病随即痊愈。于是城中抬着病人来就医的，每天也以千计，都痊愈离开了。不久，症状转变为咳嗽，咳嗽很轻微，但不到半天就死亡。当时李君已经离开京城。有知情的人说：“这也是痧症。”使用之前的挑刺方法，也随即痊愈。我当时亲眼目睹了这件事，回来后与懂医的人谈论，最终是怀疑和相信各占一半。没过多久，我们家乡挑痧的方法就盛行了。在此之前，乡里有人因感受粪秽之气而患痧，利用钱币或物品蘸油进行刮痧；到了这个时候，大多采用挑刺法。然而这种方法主要在妇女中施行，因此名医们不予提及。等到查阅医书，古代没有论述过此病，后人虽有“青筋”的说法，仍然简略而不详细，因此寻求信任的人少，怀疑的人更多。用药的方剂，于是被搁置不论。人不幸染上这种病症，没有能完全幸存的。唉！这真是令人怜悯啊。友人右陶郭明理先生读书之余，广泛搜集医学知识，看到近来患痧症的人日益增多，而治疗瘀滞的方法却很少听说，于是精心思考，推究源于小儿痧疹的原理，同时参考古方，发现有很多虽不言“痧”但蕴含治痧之意者，并且在各种救治验证中，没有不灵验的，因此更加自信。于是发愿将此法推广至天下后世，以拯救百千万人的生命，撰写了《玉衡》一书。右陶的心意迫切啊，右陶的功劳巨大啊！右陶曾经说：“痧症本来没有固定的脉象，凡是脉象与所患症状不相符合的，就是痧症的脉象；痧症也没有固定的症状，无论是感受风邪、食积、劳倦还是痰饮，如果用常规方法治疗无效，都是痧症的症状。”为此制定方剂，使人们知道遵循；记录疗效，使人们知道相信；最后以药性说明结束，使人们知道用药有适宜和不适宜之处，与其他病症不同。右陶治疗痧症的方法，在这本书中全面展现，世人将读这本书来治疗痧症，兼治右陶未能顾及之处。右陶的心愿，于此大快。虽然不想居功，但功劳又归于谁呢！我既见识了痧症的事例，又相信右陶的理论，敢于为此作序，虽然这些话不足以对愚昧之人说道。时康熙十四年乙卯重阳节，同乡王庭题写。
Recall in the autumn of the Guiwei year, I was in Yanjing (Beijing), when an epidemic broke out on a large scale. Patients presented with slight fullness in the chest and abdomen, and white fur like sheep's wool grew on their tongues. Thousands died daily, and no one knew what disease it was. Li Jun, a Juren (provincial graduate) from Haichang, observed this and said, "This is Sha syndrome." Treatment involved pricking with needles to release blood, after which the illness healed immediately. Consequently, thousands were carried into the city seeking medical attention each day, all recovering and leaving. Shortly thereafter, the symptoms changed to coughing. The cough was mild, yet patients died within half a day. At that time, Li Jun had already left the capital. Those who understood remarked, "This is also Sha syndrome." Using the previous pricking method, they also recovered immediately. I witnessed these events personally. Upon returning home, I discussed them with those knowledgeable in medicine, resulting in equal shares of skepticism and belief. Before long, the needle-pricking method for Sha became prevalent in my hometown. Previously, locals suffering from Sha induced by filth used scraping with oil-dipped coins or objects; at this time, however, pricking was mostly used. Nevertheless, this practice was mainly performed by women, so renowned physicians did not mention it. Consulting medical texts, there were no ancient discussions on this condition. Later authors mentioned "green veins" but remained brief and unclear, leading to few believers and many skeptics. Prescriptions for medication were thus set aside. Unfortunately, those contracting this illness rarely survived. Alas! This is truly pitiable. My friend, Mr. Guo Mingli (courtesy name You Tao), while studying, extensively searched medical literature. Seeing the increasing number of Sha cases and the lack of methods for treating stasis, he pondered deeply, tracing the principles back to childhood exanthematous diseases (Sha zhen), and consulted ancient prescriptions. He found many ancient texts that did not explicitly mention "Sha" but contained the intent of treating it. These methods proved effective in various rescue attempts without failure, strengthening his confidence. He then vowed to spread this knowledge to the world and future generations to save millions of lives, authoring the book *Yu Heng*. Mr. You Tao's dedication was profound, and his merit great! Mr. You Tao once stated, "Sha has no fixed pulse; any pulse inconsistent with the presenting symptoms indicates Sha. Sha has no fixed symptoms; whether caused by wind, food stagnation, fatigue, or phlegm, if standard treatments fail, it is Sha." He established formulas for adherence, recorded efficacies for trust, and concluded with drug properties to clarify appropriate and inappropriate uses, distinguishing it from other diseases. The methods for treating Sha are comprehensively presented in this book. Readers will use this text to treat Sha and address cases beyond Mr. You Tao's scope. His aspirations are thereby fulfilled. Although he may wish to avoid credit, where else would the merit lie? Having witnessed Sha incidents and believing in Mr. You Tao's theories, I dare to write this preface, though these words may not be suitable for the ignorant. Written by Wang Ting, a fellow townsman, on the Double Ninth Festival of the Yimao year, 14th Year of Kangxi.