Chǔ Yǒng 儲泳 (Southern Sòng; CBDB id 30183), zì Wénqīng 文卿, hào Huágǔ 華谷, settled at Huátíng 華亭 (modern Sōngjiāng 松江, Shànghǎi). A shī-poet noted in his own time (the Sìkù editors cite the Yuán Zhìyuán Jiāhé zhì preserving fragments of his shī jí, otherwise lost). He was a lifelong amateur of shù shù (numerological / divinatory arts) and, having exhaustively investigated them, eventually distinguished their genuine practice from the qíng wěi (counterfeit and false) — writing the Qū yí shuō 祛疑說 (KR3j0125) as a sceptical biàn of the yīnyáng and fāngshì (magicians’) frauds, the gold-and-silver alchemy (huángbái shù) scams, and the fú yìn zhòu jué (talismanic-incantation) trade. He also composed an Yì shuō 易說 (cited by Dīng Yìdōng 丁易東) and a Lǎo zǐ zhù (commentary on the Dào dé jīng). The Sìkù editors praise him as “though wandering through the Dào arts, ultimately compromising with the principles of the classics — accordingly his arguments are firmly on the orthodox path.”