Woodcut illustration from an edition of 1833 (13th year of Daoguang reign period of Qing dynasty). The image and text give an account of the principles of diseases treated with decoction of Chinese thorowax root (chaihu) and cassia twig (guizhi), and the therapeutic effects of the individual ingredients of this remedy. Decoction of Chinese thorowax root and cassia twig is used to treat diseases simultaneously affecting the taiyang and shaoyang channels, or in cases where an untreated external disease of the taiyang channel has spread to the shaoyang channel. This recipe combines thorowax root and cassia twig. Cassia twig is able to clear external malign Qi from the taiyang channel, while thorowax root clears semi-internal semi-external malign Qi from the shaoyang channel. The other symptoms -- fever, intolerance of cold, pain and discomfort in the limbs and joints, bitter taste in the mouth, vomiting, a feeling of knots in the area below the heart - can be alleviated at the same time.