The author’s “preface to his non-final draft” (or postf. in the 1832 ed.) begins with a history of the Xiyuan lu text under the Qing; then it explains that the present work aims at correcting the errors and explaining the terms in the various texts cited at the beginning, including the plates of the skeleton with checklists (檢骨圖格) that were appended in 1770 following the request of Anhui surveillance commissioner Zengfu 增福. Interestingly, Yao insists that a correct application of the law presupposes a knowledge of both Confucianism (儒) and medicine (醫). The 30 entries include many original views, notably on the skeleton and eye muscle.