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Fangfeng (Radix Saposhnikoviae) and Huangqi (Radix Astragali) are often used together by people in the world. In the Tang Dynasty, Xu Yinzong served as the External Military Staff Officer for the Prince of Xincai. The prince's mother suffered from wind disease (stroke or paralysis caused by wind pathogen), was unable to speak, and her pulse was deep and difficult to diagnose; physicians declared their medical skills exhausted. Yinzong said, "Oral liquid medication cannot be administered." He then boiled several hundred hu (an ancient unit of volume) of decoction made of Huangqi (Radix Astragali) and Fangfeng (Radix Saposhnikoviae), placed it under the bed, and allowed the medicinal vapor to fumigate the patient like a mist. That evening, she regained her ability to speak.

At the end of the Kaiyuan era of the Tang Dynasty, the court sought out the recl Jiang Fu, who was said to be hundreds of years old, and summoned him to the Jixian Academy. Jiang Fu stated that consuming Changchunteng (Stem and Leaf of Aristolochia Manshuriensis) could turn white hair black again, thereby achieving longevity. Changchunteng grows in the Taihu region, and is also common in Zhongnan Mountain. The Emperor sent envoys to collect large quantities to bestow upon elderly ministers. An edict was issued throughout the realm for people to seek it themselves. Jiang Fu was promoted to Silver-Qing Guanglu Daifu (a high honorary title) and given the title Chonghe Xiansheng (Master of Harmony). Jiang Fu further claimed that there was a plant called "Hanou" (Dry Lotus Root) in Zhongnan Mountain; consuming it could extend life, and its appearance resembled Polygoni Cuspidati Rhizoma et Radix (Gefen Fen). The Emperor had it prepared as soup cakes and bestowed them upon high officials. Gan Shoucheng, Right Xiaoqi General, said: "Changchun is Qiansui Teng (Thousand-Year Vine), and Hanou is Dumeng." Physicians had long ceased using these substances; Jiang Fu changed their names to mystify them. Commoners soaked the vine in wine and drank it, resulting in many sudden deaths. Consequently, the practice was banned. Feeling ashamed internally, Jiang Fu requested to retreat to Yaolao Mountain and subsequently fled. This account is recorded here to address worldly doubts.

Currently, many people use Huangqi (Radix Astragali) to treat dysentery, likely adhering strictly to the principle that "bitterness dries dampness." Lower-class individuals, seeing only intestinal deficiency leading to leakage and slight traces of blood in the stool, immediately administer it without knowing when to stop. They disregard the degree of cold or heat syndromes, considering the completion of one dose as the limit, which often leads to critical and distressing conditions. If the qi is substantial and the illness is recent, with heat-predominant bloody dysentery, administration stops once symptoms cease, and it is not necessary to finish the entire dose. If the condition is deficient and cold, it should not be taken. Other cases should follow the classics.

Da Lan Shi (Seed of Isatidis) is indeed the seed of Isatis Indigotica Folium (Lan Ye); calling it Liaolan (Polygoni Tinctorii Folium) is incorrect, as described in Er Ya (The Classic of Names). It can resolve various drug poisons and is indispensable. Both the seed and the leaf are used. The Commentary only explains the blue leaf and fails to explain the seed, which is incomplete. The Classics have already explained this thoroughly. The Lan plant has several colors—bamboo-scraping color, green-blue, cloud-jade color, cyan-blue, and yellow—is this not an example of "blue comes from the indigo plant but is bluer than the plant itself"? The juice of fresh Lan leaves can resolve drug toxicity; this refers to Dayelan (Large-leaf Indigo), which is distinct from Liaolan. Liaolan (Polygoni Tinctorii Folium) yields juice when kneaded, used for dyeing emerald green. Its flowers grow in long spikes, are small, and light red.