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Preface by the Author states: Treating disease is akin to governing a state. One who governs a state must examine past events of chaos and disorder, as well as the gains and losses of correct governance, before weighing them against the times and assessing the circumstances, thereby deciding what to reform and what to inherit. One who treats disease must understand the insights into pathogenesis and the methods of treatment employed by former sages, before integrating these with the patient's constitution and distinguishing regional environmental factors, thereby deciding what to add and what to subtract. Generally, there is no one who does not model themselves on antiquity yet benefits the present, nor is there any discourse lacking literary merit that can be transmitted far. Since my youth (around age twenty), I have enjoyed extensively studying medical texts. From the works of Huangdi (Yellow Emperor) and Qibo (Grand Master Qi) down to modern books, upon searching and reading them, wherever I had insights—whether agreeing or doubting—I would immediately record them on bamboo slips. Although my knowledge was not extensive, as days and months passed, volumes accumulated. Formerly, Zhen Dexiu (Zhen Xishan) compiled the *Dushu Ji* (Records of Reading), telling his disciples: "This is the gateway for rulers to govern. If anyone were to employ me, I would take this with me." My compilation of this collection follows the intent of Zhen Xishan's *Dushu Ji*. Taking this with me allows one to respond to infinite changes. Recorded by You Yi, styled Yinhe Shanshan.

Preface by Xu Dachun states: Wenzhongzi said: "The physician relies on 'Yi' (intellectual comprehension/intuition); the medicine acts as 'Yue' (to dissolve/clear)." This means one must first comprehend the underlying principles intellectually, and then use medicinal substances to clear and resolve the pathology. How excellent these words are! The principle of medicine lies herein, yet truly comprehending 'Yi' is genuinely difficult. Clinging to fixed views and attempting to force a patient's condition to fit one's own theory results in the fault of stubbornness. Preferring to act cleverly without thoroughly investigating the established works of ancients results in the fault of ignorance. In the former case, the error lies in the inability to apply intellectual comprehension; in the latter, it lies in the misapplication of such comprehension. Thus, using the knowledge of an unlearned person, combined with an uncritical understanding, further inflamed by jealousy towards colleagues and a competitive desire for fame and profit, employing such individuals to prescribe medication—how many would avoid the outcome of carrying firewood to save a fire or throwing stones into water (acting counterproductively)? As the saying goes: "Learning calligraphy wastes paper; learning medicine wastes lives." This refers precisely to this situation. Jun You, residing in Jingxian, is a scholar who loves reading and reveres antiquity, yet he devotes his efforts to medicine. Regarding the texts from Huangdi and Qibo downwards, he studied them tirelessly through all seasons and times, penetrating their depths almost completely, and organized them according to his own understanding. Wherever he gained insights, he recorded them in writing. As time passed, the volumes were largely finalized. He analyzed the generation and restriction of the Five Elements, investigated the warmth and severity of the Four Qi, examined the yin-yang deficiency and excess of human affairs, and the sovereign-minister-assistant-courier roles of medicinal properties. He corrected errors inherited in existing texts and arbitrated among the numerous debates of ancient scholars. Only by reading many ancient books can one make good use of them, avoiding both the misuse and the rigid adherence to intellectual application. Regarding the principles of Changsha (Zhang Zhongjing), he has likely grasped them. One may say he has truly comprehended the 'Yi'. Furthermore, observing Sima Qian's biography of Bian Que, it states that Changsang Jun gave him secret prescriptions entirely, after which he disappeared; subsequently, Bian Que could revive the dead. This explanation borders on the supernatural, and such a person cannot be obtained again. However, in his account of Chunyu Yi, it says he received secret prescriptions from Gongcheng Yang Qing and was taught the *Huangdi Bianque Pulse Book* and the method of diagnosing diseases through five colors. These instances demonstrate that reading extensively and comprehending intellectually leads to mastery. I cannot see Bian Que anymore; if I could see someone like Chunyu Yi, that would suffice. I do not know how Jun You's learning compares to the ancients, but by reading much and comprehending through intellect, he is inspired by the ethos of the ancients. By using this book to treat diseases, he will hardly incur ridicule for wasting lives. Written in the third month of spring, Jiyi year of the Qianlong era (1739), by Lingtai (Xu Dachun) of Songling.

*Yixue Xuji* (Continued Records of Medicine), one volume, extant.
*Jingxianglou Yian* (Medical Cases of Jingxiang Pavilion), one volume, extant.