Mid-19th-century physician, zì Yúnchá 雲槎. Active around the 1850s. Author of the original Shí xíng fú yīn lùn 時行伏陰論 (1854), re-edited in 1922 as KR3eb042 Chóng dìng shí xíng fú yīn chú yán. The work argues for a clinical distinction between cholera and the fú yīn 伏陰 latent-yīn disorder, with substantial implications for prescriptive practice during the Qing cholera pandemics. No CBDB record; lifedates undetermined.