医之为道，精矣微矣。脏腑生成之象，经络起止之原，六气循环之理，五行生克之机，必须一一讲求明
白，始可以论证出方。学问有体，而后有用，岂可区区专重夫末节哉，然脏腑、经络、六气、五行之说，
《内经》、《难经》、《伤寒》、《金匮》诸书言之详矣。而后世名医，阐发《经》旨，亦不留余蕴，一经
披览，即可识其指归。惟论证出方，自金元以来，诸医议论纷歧，各逞臆见，致令后之业医者，分门别户，莫
得真传，有心人所为感慨系之也！余留心医学，三十余年。检阅方书，数十余部。除《伤寒》、《金匮》而
外，求其与《内经》之旨相合者，颇少。惟我朝名医辈出，如喻嘉言、徐灵胎、高士宗、张隐庵、陈修园、黄
元御诸公，皆远宗歧黄，近法仲景，其著作洵远迈前贤矣。六子所论脏腑经络，六气五行之理，均足发挥《
内经》诸书。惟徐灵胎之《医学源流论》，尤爽快警辟。黄元御之《天人解》、《六气解》，尤显亮透澈，
更有发前人所未发处。至论证出方，喻、徐二公，立论虽极力尊古，而所取时方，仍有驳杂不纯之处。高、
张二公，有论无方。惟陈、黄两家，其论证出方，俱精简可取，其大旨悉本于圣经，真医学入门之正路也。余
公余之暇，采二子之精纯者，合纂为一编。其有二子所未备者，仅采各名医之说以补之。倘业医者，执是编
而熟读玩味，庶免歧路亡羊之叹也夫！
光绪二十一年岁在乙未二月朔日云阁氏自叙
医学这门学问，真是精妙而深微啊。脏腑生成的形态，经络起止的源头，六气循环的道理，五行生克的机制，必须一一探究明白，才可以进行辨证并开具方剂。学问要有根本，然后才能有所应用，怎么能仅仅专注于细枝末节呢？然而，关于脏腑、经络、六气、五行的学说，《内经》、《难经》、《伤寒论》、《金匮要略》等书籍已经阐述得很详细了。而后世的名医，阐发经典旨意，也毫无保留，一经翻阅，就能识别其主旨所在。只有辨证开方这一环节，自金元以来，各位医生的议论分歧，各自逞显主观见解，导致后来行医的人，分门别派，得不到真正的传承，这是有心之人所感慨叹息的！我留心医学，三十多年。检阅方书，几十多部。除了《伤寒论》、《金匮要略》之外，寻求那些与《黄帝内经》旨意相合的，很少。只有本朝名医辈出，如喻嘉言、徐灵胎、高士宗、张隐庵、陈修园、黄元御诸位先生，都远宗岐伯、黄帝，近法张仲景，他们的著作确实远远超越前贤。这六位先生所论述的脏腑经络、六气五行之理，都足以发挥《内经》诸书的精髓。其中徐灵胎的《医学源流论》，尤其爽快犀利。黄元御的《天人解》、《六气解》，尤其显豁透彻，更有前人未曾发掘之处。至于辨证开方，喻、徐二位先生，立论虽然极力尊崇古法，但所选取的时方，仍有驳杂不纯的地方。高、张二位先生，有论述没有方剂。只有陈、黄两家，他们辨证开方，都精简可取，其大旨完全基于经典，真是医学入门的正路。我在公余闲暇之时，采集这两位先生的精纯内容，合编为一卷。如果有这两位先生所未完备的，仅采集各名医的说法来补充它。如果行医的人，拿着这本书熟读玩味，或许可以避免歧路亡羊的感叹吧！
光绪二十一年岁在乙未二月朔日云阁氏自叙
The Way of Medicine is indeed profound and subtle. The morphology of the formation of Zang-Fu organs (viscera and bowels), the origin of the starting and ending points of the meridians, the principles of the circulation of the Six Qi (Six climatic factors: Wind, Cold, Summer-heat, Dampness, Dryness, Fire), and the mechanism of the generation and restriction among the Five Elements (Wood, Fire, Earth, Metal, Water) must be thoroughly investigated and understood before one can conduct syndrome differentiation and prescribe formulas. Learning requires a foundation before it can be applied; how can one merely focus on trivial details? However, the theories regarding Zang-Fu organs, meridians, Six Qi, and Five Elements have been elaborated in detail in classics such as *Huangdi Neijing* (Yellow Emperor's Inner Canon), *Nan Jing* (Classic of Difficult Issues), *Shanghan Lun* (Treatise on Cold Damage Disorders), and *Jingui Yaolue* (Essential Prescriptions of the Golden Cabinet). Later famous physicians expounded upon the intent of these classics without holding back any insights; upon reading them, one can grasp their main purport. It is only in the aspect of syndrome differentiation and prescribing that, since the Jin and Yuan dynasties, various physicians have held divergent opinions, each displaying subjective views. This has caused subsequent practitioners to divide into different schools, unable to receive true transmission, which is a source of sighs for those concerned with the field. I have devoted myself to medicine for over thirty years. Having reviewed dozens of medical texts, apart from *Shanghan Lun* and *Jingui Yaolue*, I found very few others whose intent aligns with *Huangdi Neijing*. Only in our dynasty have numerous famous physicians emerged, such as Yu Jiayan, Xu Lingtai, Gao Shizong, Zhang Yinan, Chen Xiuyuan, and Huang Yuanyu. All of them revered Qi Bo and Huang Di in the distant past and followed Zhang Zhongjing in recent times; their works truly surpass previous sages. The discussions by these six gentlemen on the principles of Zang-Fu organs, meridians, Six Qi, and Five Elements are sufficient to elaborate on the various books of *Huangdi Neijing*. Among them, Xu Lingtai's *Yixue Yuanliu Lun* (Discussions on the Origins and Development of Medicine) is particularly refreshing and incisive. Huang Yuanyu's *Tianren Jie* (Explanation of Heaven and Humanity) and *Liuqi Jie* (Explanation of the Six Qi) are especially clear and transparent, containing insights not previously discovered. Regarding syndrome differentiation and prescribing, although Mr. Yu and Mr. Xu strongly advocated respecting ancient methods in their theoretical arguments, the contemporary prescriptions they selected still contained impurities. Mr. Gao and Mr. Zhang provided theories but no prescriptions. Only the approaches of Mr. Chen and Mr. Huang, in both syndrome differentiation and prescribing, are concise and worthy of adoption; their general principles are entirely based on the sacred classics, representing the correct path for entering the study of medicine. During my leisure time after official duties, I collected the purest essence from these two gentlemen and compiled it into one volume. For matters not covered by these two, I supplemented them with statements from other famous physicians. If practitioners hold this volume and read it carefully, pondering its meaning, they may avoid the lament of losing the way due to too many paths!
Autobiographical Preface by Yun Ge Shi, on the first day of the second month of the year Yiwei (1895).