Lady Wei Huacun 魏華存 (252-334) and Xu Mi 許謐 (303-376) founded the Taoist Shangqing School. The Shangqing scriptures were supposedly dictated to Yang Xi 楊羲 (330-c. 386) in nightly revelations from immortals, and Needham proposed Yang was "aided almost certainly by cannabis". The "Mingyi bielu" 名醫別錄 ("Supplementary Records of Famous Physicians"), written by the Taoist pharmacologist Tao Hongjing (456-536), who also wrote the first commentaries to the Shangqing canon, says, "Hemp-seeds (麻勃) are very little used in medicine, but the magician-technicians ("shujia" 術家) say that if one consumes them with ginseng it will give one preternatural knowledge of events in the future." A 6th-century AD Taoist medical work, the "Wuzangjing" 五臟經 ("Five Viscera Classic") says, "If you wish to command demonic apparitions to present themselves you should constantly eat the inflorescences of the hemp plant."