Xūbái Zhǔrén 虛白主人 (“the Master of the Hollow-White”) is the only name preserved for the otherwise unidentified Qīng wandering physician whose recipes were edited and printed by his disciple Lǐshēng 李生 of Hóngdū 洪都 (Nánchāng, Jiāngxī) as the Jiùshēng jí 救生集 KR3ed071. The work’s preface relates that Xūbái was a traveller of unknown native place who came to Nánchāng in a jiǎshēn 甲申 year (probably 1764 = Qiánlóng 29, given the surrounding context of mid-Qiánlóng publishing activity in Jiāngxī, though 1704 or 1824 are not impossible). He cured Lǐshēng’s near-blindness with a single formula, took Lǐ on as a student, and entrusted him with the editing of his manuscript-bag of tested recipes. Xūbái continued to wander for over a decade afterwards, “habitually distributing pills and powders to save people, never failing in effect.” The honorific Xūbái 虛白 (“empty whiteness,” the cleared, attentive mind of the Zhuāngzǐ chapter 4) suggests a Daoist self-presentation. No CBDB entry.