Rèn Xīgēng 任錫庚, late-Qīng physician of obscure biographical record. Author of KR3ep086 Wángshì yīàn yìzhù, an eleven-juǎn annotated study-edition of the 王士雄 Wáng Mèngyīng Wángshì yīàn trilogy. The text circulated as a pedagogical reference in late-Qīng and early-Republican Chinese-medical schools, where Wáng’s classical-medical density required commentary-mediation. Not in CBDB.