宝子玉珊，余世好也。卓 有大志，而酷嗜医，少时读《灵、《素》、《玉函》诸经，有神
悟。若熟识者，其谈医则按病施治，毫无难色。余尚不之信，适余患温病，十余日数易医矣。
玉珊为出一方，投之立效，始信玉珊之有得于医为不诬云。然余究惜玉珊之自小其志，而未
观于读书致用之大也。而玉珊则视弃举之业，如弃敝屣，以为从事占HT ，规规于记诵词章之
末，即幸获一第，亦复于世何裨？是则玉珊之牢骚郁抑，因托于医以自见者。岁丙申余治装
北上，赴部供职，而玉珊亦于是岁出游，由是天各一方，几及四年。旋余以读礼家居，就馆
于鄂之抚署。季夏假归，玉珊亦先于前月旋里，握手道故，欢逾平生，出所着《易知录》、《医
藉选》、《游艺志略》、《夜谈随记》各种而请序于余。余固不能辞，惜余少究心岐黄，未识玉珊
医术，果能阐《内经》之奥旨，窥仲圣之秘蕴否？但自玉珊之立意言之，亦若惩世之庸医杀
人，而有所不得已者，则以是延颈翘首而望之曰∶玉珊之书，其传矣乎！是为序。
光绪庚子立秋之后一日前工部主事愚小兄迎喜雨亭甫识
医学之难，难于无偏，无偏者仲景一人而已。厥后方书汗牛栋，以偏得名者莫胜于金元，
如子和偏攻，丹溪偏补，河间偏凉，东垣偏温，入主出奴，愈趋愈下。而学古者泥古，执一
家言，妄辨得失，非偏于寒证治法，即偏于温证疫证治法。殊不知寒温疫三证，包括者广，推
之霍乱、疟痢、吐血、咳嗽，莫不各有斯三者，是三证明，而诸外感证，自迎刃而解。何偏
之有？夫医本全生术耳。今习是术者，全生适足以伤生。盖欲人之生者，是其心。速人之死
者，是其术。无他，医庸故也。天下多一明医，而所全者众，少一庸医，而所全者更众。兹
编其欲化庸医为明医，俾使融会三者，同归于无偏而后已，未始非救偏之一助乎？
光绪辛丑夏仲西园居士撰于辅文书院之南轩
宝子玉珊，是我世代交好的朋友。他志向卓越远大，且极度酷爱医学。年少时研读《灵枢》、《素问》、《玉函经》等经典，有着神妙的领悟力，仿佛早已熟识一般。他谈论医学时，能够根据病情施以治疗，毫无难色。我起初并不相信（他的医术），恰逢我患上温病，十多天内更换了好几位医生。玉珊为我开出一方药，服用后立刻见效，我才相信玉珊在医学上确有心得，并非虚言。然而，我始终惋惜玉珊将自己的志向看得太小，而没有看到通过读书来应用于大事的道理。而玉珊则视放弃科举举业如同扔掉破鞋一样，认为从事占卜算命，拘泥于记诵词章的细枝末节，即使侥幸考中功名，对世道又有什么益处呢？因此，玉珊心中的牢骚和压抑，便寄托于医学以显示自己的才能。丙申年，我整理行装北上，前往吏部供职，而玉珊也在这年外出游历，从此天各一方，将近四年。不久，我因守丧居家，在湖北巡抚衙门担任幕僚。夏季休假回家时，玉珊也在前一个月回到了家乡，我们握手叙旧，欢乐超过平生。他拿出所著的《易知录》、《医藉选》、《游艺志略》、《夜谈随记》等各种书籍，请求我为它们作序。我实在不能推辞，只是可惜我年轻时并未深究岐黄之术，不认识玉珊，不知道他的医术是否真能阐发《内经》的深奥旨意，窥探张仲景的隐秘蕴涵呢？但从玉珊立意的角度来看，也是为了惩戒世间庸医杀人，而有所不得已才这样做，于是伸长脖子踮起脚跟盼望道：玉珊的书，大概会流传下去吧！这就是序言。
光绪庚子年立秋之后一日，前工部主事愚弟迎喜雨亭甫识
医学的难点，在于没有偏颇，只有张仲景一人做到了无偏。此后的医书多如牛马之汗、房屋之栋，以偏颇而闻名的，没有超过金元四大家的。比如张子和偏重于攻下，朱丹溪偏重于滋补，刘河间偏重于寒凉，李东垣偏重于温热。他们互相排斥，愈趋愈下。而那些学习古人的人拘泥于古法，执着于某一家的言论，胡乱辨别得失，不是偏重于寒证治法，就是偏重于温证疫证治法。殊不知寒、温、疫三种证候，涵盖范围很广，推广开来，霍乱、疟疾、痢疾、吐血、咳嗽等疾病，无不各自包含这三种情况。只要弄明白了这三证，那么各种外感病证，自然就能迎刃而解。哪里还有什么偏颇呢？医学本是保全生命的技艺。如今学习这门技艺的人，保全生命反而足以伤害生命。没有什么其他原因，是医生平庸的缘故啊。天下多一位明医，所保全的生命就多；少一位庸医，所保全的生命就更多。这部编著，旨在将庸医转化为明医，使他们融会贯通上述三者，最终归于无偏颇的境界，这未尝不是纠正偏颇的一个帮助吧？
光绪辛丑年夏月，西园居士撰写于辅文书院的南轩
Bao Ziyushan is a friend of my family's long-standing friendship. He possessed lofty and great ambitions, and was passionately devoted to medicine. In his youth, he studied classics such as *Ling Shu* (Spiritual Pivot), *Su Wen* (Basic Questions), and *Yu Han Jing* (Jade Chest Classic), demonstrating divine comprehension, as if he had known them intimately. When discussing medicine, he could prescribe treatments according to the disease without any hesitation or difficulty. I initially did not believe him. Coincidentally, I contracted Warm Disease (Wen Bing, febrile diseases caused by warm pathogens), and changed physicians several times over ten days. Yushan prescribed a formula for me, which took effect immediately upon administration. Only then did I believe that Yushan's expertise in medicine was genuine and not false. However, I always regretted that Yushan limited his ambitions too narrowly, failing to see the greater value of studying books for practical application. Yushan viewed abandoning the imperial examination career as discarding worn-out shoes, believing that engaging in divination and fortune-telling, or being pedantic about memorization and literary composition, would be of no benefit to the world even if one were fortunate enough to pass the exams. Thus, Yushan's grievances and suppressed feelings were channeled into medicine as a means to demonstrate his worth. In the year Bing Shen, I packed my bags to travel north to take up a post in the Ministry of Personnel, while Yushan also went out to travel that same year. From then on, we were separated by vast distances for nearly four years. Later, I returned home to observe mourning rituals and served as a secretary at the Hubei Provincial Governor's office. During my summer leave, I returned home, and Yushan had already returned to his hometown the previous month. We shook hands and reminisced, our joy surpassing that of any other time in life. He presented various works he had authored, including *Yi Zhi Lu*, *Yi Ji Xuan*, *You Yi Zhi Lue*, and *Ye Tan Sui Ji*, and requested that I write a preface for them. I could hardly decline, but I regret that I did not study the arts of Qi Huang (traditional Chinese medicine) deeply in my youth and do not know if Yushan's medical skills can truly elucidate the profound principles of *Nei Jing* (Inner Canon) and uncover the hidden mysteries of Zhang Zhongjing. However, from the perspective of Yushan's intent, it seems he sought to condemn the killing of people by mediocre doctors in the world, feeling compelled to act. Thus, he looked forward with anticipation, saying: "Yushan's books will surely be transmitted!" This is the preface.
Recorded by Ying Xi, styled Yuting, humble younger brother and former Principal Clerk of the Ministry of Works, one day after the Start of Autumn in the Gengzi Year of Guangxu.
The difficulty of medicine lies in avoiding bias; only Zhang Zhongjing achieved this state of non-bias. Subsequent medical texts were numerous, yet those who gained fame through bias surpassed all others during the Jin and Yuan dynasties. For instance, He Zi (Zhang Yuansu/Zhang Henzi) biased towards purgation, Dan Xi (Zhu Zhenheng) biased towards tonification, He Jian (Liu Wansu) biased towards cooling, and Dong Yuan (Li Gao) biased towards warming. They rejected each other, leading to a downward spiral. Those who learned from antiquity were stuck in ancient ways, adhering rigidly to one school's theories, blindly debating gains and losses, either biasing towards treatment methods for Cold syndromes or biasing towards treatment methods for Warm and Epidemic syndromes. Little do they realize that Cold, Warm, and Epidemic syndromes cover a broad range. Extending this logic, Huoluan (Cholera/acute gastroenteritis), Nüeli (Malaria and Dysentery), Tuxue (Hematemesis), and Kesou (Cough) all contain these three types. Once these three syndromes are understood, all external contraction syndromes can be resolved effortlessly. Where is the bias? Medicine is originally an art to preserve life. Today, those who practice this art often harm life instead of preserving it. There is no other reason; it is due to the mediocrity of the doctor. If there were more enlightened doctors in the world, more lives would be saved; if there were fewer mediocre doctors, even more lives would be saved. This compilation aims to transform mediocre doctors into enlightened ones, enabling them to integrate the three approaches and ultimately return to a state of non-bias. Is this not a help in correcting biases?
Written by the Layman of Xiyuan in the South Pavilion of Fushi Academy in the mid-summer of the Xin Chou Year of Guangxu.