货生药焦百善云∶有荛夫来买苦参，欲治疥。不识药性缓急，但闻人言可治
，浓煎一碗服之。须臾，大吐涎一盆，三、二日疥作痂矣。
一小儿名德孙，眼发赤。其母买铜绿，欲洗儿目。煎成，家人误与儿饮之。须臾大吐，吐讫立开。
焦百善，偶感风寒，壮热头痛。其巷人点蜜茶一碗，使啜之。焦因热服之讫，偶
思戴人语曰∶凡苦味皆能涌。百善兼头痛，是病在上，试以箸探之毕，其痛立解。
一妇人年二十余岁，病经闭不行，寒热往来，咳嗽潮热。庸医禁，切无物可食。
一日当暑出门，忽见卖凉粉者，以冰水和饮，大为一食，顿觉神清骨健，数月经水自下。
一男子脏毒下血，当六月间，热不可堪，自甘于死。忽思冰蜜水，猛舍性命，饮一大盂，痛止血住。
一男子病脓血恶痢，痛不可忍。忽见水浸甜瓜，心酷喜之，连皮食数枚，脓血皆已。
人言下痢无正形，是何言也？人止知痢是虚冷，温之、燥之、涩之、截之，此外无术矣。岂知风
、暑、火、湿、燥、寒六者，皆为痢。此冰蜜甜瓜所以效也。
戴人在西华夏公宅，其仆郑驴病，法当吐。命女僮下药，药失不制，又用之太多
，涌之不出，反闷乱不醒，乃告戴人。戴人令以薪实马糟，既平，舁郑驴卧其上，倒垂其头
。须臾大吐，吐讫而快。戴人曰∶先宜少进，不涌旋加。
西华一老夫病，法当吐。令门人栾景先下药。景先初学，其人不吐，反下走二行，乃告戴人
。戴人令取温齑汁，饮二碗，再下涌药一钱，以鸡翎探之乃吐，既药行，方大吐。吐讫又安
。戴人曰∶凡用吐药，先以齑汁一碗横截之。药既咽下，待少倾，其鸡翎勿令离口。酸苦
咸虽能吐人，然不撩何由出也？
李仲安宅四妇人病同，日下涌剂，置燠室中火两盆，其一妇人发昏，众人皆惊。戴人笑曰∶
内火见外火故然。舁之门外，使饮冰雪水立醒。时正雪晴。戴人曰∶热见寒则醒。众由是皆
服。非老手谙练，必不能镇众人之惊也。
Jiao Baishan, a merchant of medicinal herbs, said: A woodcutter came to buy *Radix Sophorae Flavescentis* (Kushen, 苦参) to treat scabies. Unaware of the drug's mild or potent nature, he merely heard that it could cure the disease and decocted a bowl in high concentration for oral administration. Shortly after, he vomited profusely, expelling a basin of saliva-phlegm. Within two or three days, the scabies crusted over and healed.
A child named Desun had red eyes. His mother purchased *Viriditas Cupri* (Tonglü, 铜绿) intending to wash his eyes with the decoction. By mistake, the family gave the liquid to the child to drink. Soon after, the child vomited violently; immediately after vomiting ceased, his eyes returned to normal.
Jiao Baishan accidentally contracted wind-cold, presenting with high fever and headache. A neighbor offered him a bowl of honey tea. Because Jiao felt internal heat, he drank it while hot. He then recalled Dai Ren’s (Zhang Congzheng) words: "All bitter substances can induce emesis." Jiao reasoned that since he also suffered from headache, indicating the pathogen was located in the upper jiao, he tried inducing emesis by probing his throat with chopsticks. Upon completion, his headache resolved instantly.
A woman in her twenties suffered from amenorrhea, alternating chills and fever, coughing, and tidal fever. Quack doctors prohibited her from eating anything. One day, during summer heat, she went out and saw a vendor selling cold jelly noodles. She consumed a large portion mixed with ice water. Immediately, she felt refreshed and vigorous, and her menses resumed naturally after several months.
A man suffered from bloody stools due to visceral toxin (zangdu). It was June, and the heat was unbearable; he resigned himself to death. Suddenly craving ice honey water, he drank a large bowl at the risk of his life. The pain stopped, and the bleeding ceased.
A man suffered from severe dysentery with pus and blood, enduring intolerable pain. He suddenly saw melons soaked in water and felt intense joy. He ate several whole melons, including the skin, and the pus and blood disappeared. People say that dysentery has no fixed form; what nonsense is this? People only know that dysentery is a deficiency-cold syndrome and apply warming, drying, astringent, or obstructive methods, believing there are no other techniques. How could they know that wind, summer-heat, fire, dampness, dryness, and cold—the six qi—can all cause dysentery? This explains why ice water and sweet melon were effective.
While Dai Ren was staying at the residence of Lord Xihua, his servant Zheng Lü fell ill. According to the treatment principle, emesis was indicated. Dai Ren ordered a female servant to administer the emetic. However, the dosage was not controlled properly, and too much medicine was used. Emesis failed to occur; instead, the patient became confused and unconscious. He reported this to Dai Ren. Dai Ren instructed others to fill a pile of horse dung with firewood. Once leveled, Zheng Lü was placed on top lying supine, with his head inverted. Shortly after, he vomited profusely and felt relieved afterward. Dai Ren stated: "Initially, one should administer a small dose; if emesis does not occur, gradually increase the amount."
An old man in Xihua fell ill and required emesis. Dai Ren asked his disciple Luan Jingxian to prepare the medicine. As a novice, Luan administered the drug incorrectly; the patient did not vomit but experienced diarrhea twice. He reported this to Dai Ren. Dai Ren instructed them to obtain warm vinegar juice, have the patient drink two bowls, then administer one qian of the emetic drug again, and probe the throat with a chicken feather to induce vomiting. Once the drug took effect, severe vomiting occurred. Afterward, the patient was calm and peaceful. Dai Ren said: "Whenever using an emetic, first use a bowl of vinegar juice to intercept/moderate it. After swallowing the drug, wait a moment, and keep the chicken feather near the mouth. Although sour, bitter, and salty flavors can induce vomiting, without mechanical stimulation (probing), how will the pathogen be expelled?"
Four women at Li Zhong'an's residence suffered from the same condition. They were given emetics daily and kept in a warm room with two charcoal braziers burning. One woman suddenly fainted, causing panic among the crowd. Dai Ren laughed and said: "Internal heat encountering external heat causes this." They carried her outside and gave her ice water to drink, which revived her immediately. It was just after a snowstorm cleared. Dai Ren said: "Heat conditions awaken when exposed to cold." Everyone was convinced. Only a seasoned expert could have calmed the crowd's panic.