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Huang Buchen is a fellow student and junior colleague of mine from the Mingjing (Classics) examination. He possessed a natural disposition that was agile and spirited, being erudite and versatile. His poetry and classical prose did not fall into clichés, establishing his own unique school. Previously, he had a collection titled *Shusu Ju Cuncao* (Manuscripts from Shusu Residence), which those who saw it would often applaud with rhythmic beats, allowing one to imagine his character. It is strange that he neglected the path of Bagu (Eight-Legged Essay, for imperial examinations), instead serving others and presenting works for critique, yet seemed disdainful of listening to advice. I once severely reprimanded him, saying: "Seeking fame without attending to this is like driving south while the wheels roll north."

Later, due to separation, we grew distant from Huang. At that time, I was contemplating passing the Bagu examination to seek recognition, regretting that poetry and classical prose were burdens, unaware that he had abandoned the study of Classics and History to delve into Qihuang (Traditional Chinese Medicine), changing his love for antiquity to a love for medical arts, which had been going on for quite some time. With Huang's talent, which our peer group always admired and respected, if he had cultivated himself well, achieving virtue and merit would have been no different from ordinary people; someone mediocre like me could never catch up with his dust. Alas, he did not cherish himself, willingly lowering his aspirations to mingle in the field of ophthalmology. How sad!

Thereafter, he traveled to famous scenic spots and gained considerable reputation. I privately suspected he was deceiving people with his cleverness, which was not unusual. When I fell ill and my life was nearly lost, I encountered his treatment and recovered. I then asked him what mystery allowed such efficacy. Huang hesitatedly declined credit, saying he was not particularly quick-witted, and took out three volumes of *Mu Jing* (Classic of the Eye) from a chest. After reading it, I sighed and said: "Buchen has devoted his mind to this art, reaching such a level of precision!" Although I do not understand medicine, I felt that his explanation of the origins and details of medical principles was thorough, as if not merely set up for specialized ophthalmology. Moreover, his rare metaphors and lucid arguments were startling and delightful, making one forget it was a medical book. I realized this was not done to break conventions for shock value, but truly retained his original love for antiquity.

With the publication of this collection, *Shusu Ju Cuncao* will surely be transmitted immortally first, compared to those who pore over Bagu essays until death under their windows, remaining obscure and unrecorded—the difference is vast. Huang indeed has outstanding insight, yet fails to cherish himself. Alas! Heaven endowed Buchen with a mirror-like clarity, transforming it into a book of Chongli (Double Li, symbolizing brightness/eyes), which will illuminate the world for generations to come, enabling the blind to see. Those who are ignorant and refuse to learn may treat it as an ordinary pulse diagnosis manual, even daring to criticize it within its pages. Their blindness, however, is such that even Huang has no remedy to cure them.

Respectfully inscribed by Fellow Student Brother Li Ming