The word "rowing a boat against the current" comes from Yu Jiayan's "Moral Grass". Its method is to treat dysentery with Ginseng Baidu Powder, and decoct Ginseng Baiji Powder in thick soup. After taking it, sit in a warm place and hold back from defecation for about two hours. After sweating slightly, dysentery can be cured. Xiali is not only in the interior, but also can make evil emerge from the exterior and be solved. At first glance, Yu's prescription selection and medication can't stop there unless he has real talent and practical knowledge. However, since I read Treatise on Febrile Diseases, I know that this method was obtained by Yu Jiayan from the founder of Zhongjing.