Yì wài bié zhuàn 易外別傳

Separate Transmission Outside the Yì

by 俞琰 (Yǔ Yǎn, 1245–1314)

Yǔ Yǎn’s treatise on what lies “outside” the Zhōu yì — specifically the alchemical and meditative uses of Yì jīng cosmology. An essential companion to his Cān tóng qì studies. Preserved as DZ 1009 / CT 1009 (Tài xuán bù 太玄部).

Dating. c. 1284. Dynasty: 宋-元.