Little story of moxibustion

I have read the article notes written by the Ming Dynasty, has not remember the author’s name and title, is mentioned moxibustion, an official in the south China of the day, caught a rapist, repeatedly broke into residential homes, even raping over ten women a night. When the official saw the prisoner, very surprised, because the prisoner was an Eighty-year-old. Meanwhile, officials also greatly increased curiosity, put the prisoners mentioned in the backyard of a private room, politely ask why the elderly are still doing it, the prisoner replied, “Nothing, it just under the navel point.” The original annual winter season, certainly tens moxibustiones on navel the acupoint decades never stopped.