Medical knowledge was often documented through case-style narratives first seen in twenty-five instances in Sima Qian's Records of the Grand Historian. These instances would form prototypical templates for future medical accounts. Medical accounts from then on took a narrative voice with a secondary analytical tone focusing on a blend of storytelling, vocational knowledge, and historical recording. However, as time progressed, the vocabulary used to record the medical cases started to differ from author to author. By the time of the Qing dynasty, however, the language used to create and define the medical cases had begun to resettle, allowing for ease of inclusion of these texts into the "Siku Quanshu."