Extremely Rare: Treatise on Warm Epidemics, Original Classical Medical Text

Unearthed during a moth-proofing session at my family's old storehouse.
The details of when it was made are unknown, but I believe it's from the late Edo period.

"On'ekiron Kaigen"

-- AI Explanation Below --

About the original work: "On'ekiron" (瘟疫論), is a medical book written by **Wu Youxing (呉有性)**, a Chinese physician of the late Ming and early Qing dynasties. It is believed to have been completed in 1642 (Chongzhen Renwu).
Content: It discusses the epidemic diseases (infectious diseases) prevalent at the time, and established the foundation of a groundbreaking theory of febrile disease by attributing the cause to a pathogen called "reiki" (戻気).
Nature of "On'ekiron Kaigen": From the word "Kaigen," it is considered to be a commentary, explanatory book, or an excerpt of the original "On'ekiron."
Influence on Japan: "On'ekiron" was introduced to Japan during the Edo period, and many Wakokubon (Japanese-style printed books) were published, greatly influencing the Japanese medical world, especially the development of febrile disease studies.
The "On'ekiron Kaigen" in this image is likely a Wakokubon published in Japan after the Edo period, or a copy or original version that was brought from China. Judging from its condition, it is presumed to be quite old.

Condition: The book itself shows signs of aging, with tears in the paper, stains, and insect damage.

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