The elderly gentleman, over seventy years old, suffered from diarrhea and had repeatedly taken warming and tonifying spleen and kidney medicines. Despite the prolonged treatment, the diarrhea persisted. He invited me for a consultation. I said, "The condition you are suffering from is a case of prolonged diarrhea leading to slippery and prolapsed intestines and stomach. The 'Ten Kinds of Formula' states that tonics can eliminate weakness, and astringents can relieve collapse. Prolonged diarrhea inevitably leads to deficiency of original qi, but tonics can only replenish deficiency, not secure prolapse. Zhang Zhongjing said, 'Regulating the middle means regulating the middle jiao,' but this diarrhea is in the lower jiao, and the Red Halloysite Limonite Pill is the main treatment. Li Xianzhi said, 'When there is illness in the lower jiao, it is difficult to understand, and one must use Red Halloysite.' Moreover, the emptiness of the intestines and stomach cannot be filled without this, and the putrid stool that has been expelled cannot regain its adhesive nature without this. Yu Xi-chang treated Chen Yanzhi and Pu Junyi, who had prolonged diarrhea that did not heal, and using this method achieved remarkable results." Therefore, I added Red Halloysite and Limonite to the original prescription, and after taking it, it indeed proved effective.