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In the spring of Bingxu year, Zheng Deshun from Lunfu suffered from an acute illness; it was already the second watch of the night. He Mengying went to examine him: he saw him scratching the bed and mat, unable to speak, only pressing his hands against his chest and scratching his tongue.

Mengying said, "This is poisoning." He took two sheng (a unit of volume) of mung beans, boiled them rapidly in clear water, clarified the decoction, cooled it, and administered it orally. The patient indeed recovered instantly. The next morning, upon inquiring about the cause, Zheng finally revealed that he had long suffered from arm pain. Due to ingesting herbal medicine (grass-head medicine), immediately after swallowing, he felt unbearable chest stuffiness and tongue numbness preventing speech, while bystanders were unaware. Recording this case serves to prove Mengying's divine insight into diseases and also shows that herbal medicines should not be tried lightly.

Hu Jiquan's son, Zhenguan, accidentally developed a purple patch on his right cheekbone at that time, which was late winter. Mengying prescribed rhinoceros horn (Xijiao) and gypsum (Shigao) for cooling and resolving. After two or three doses, fever began, gradually emerging. Rhinoceros horn was taken for over twenty doses before being discontinued. He also had a chronic eye disease; residual heat erupted again from the eyes. He was ordered to take long-term gypsum-based medication, and indeed, he gradually recovered. Moreover, he could eat and his muscles became full, with no other ailments. Those who heard of this marveled.

Lu, who worked in the wine industry, was extremely poor and had suffered through upheavals. After a long time, he contracted a strange disease: emaciation and frequent itching, with lice emerging from the skin, wriggling when scratched. Medical treatments were ineffective. Mengying diagnosed, "Sorrow and hard labor have injured the Yang Qi. Damp-heat has soaked and infiltrated, transforming into parasites." He prescribed Qi-tonifying herbs plus cedar wood (Shanmu) and mulberry branches (Sangzhi), resulting in recovery.

"Totu Changshou Dan" was sold in the capital, claiming great efficacy in curing all diseases, and its price was very low; people praised it. Mengying said, "Regardless of what ingredients it contains, adhering to one formula to treat a hundred diseases is not a valid method. Each person's constitution differs, and the causes of symptoms vary. I advise people not to try it lightly. Furthermore, if it is taken with mung bean soup, it must contain heat-toxic substances internally. One must be cautious."

Subsequently, Zhang Menggao, a Shaofu (official title), developed carbuncles after taking it. Guangyue Ting Sima (official title) suffered throat ulceration after taking it. Mengying treated them with multiple doses of sweet-cold herbs, leading to recovery.

Wang Xueshan had long suffered from cold intolerance in the lower body. After taking less than one hundred pills of "Totu Dan," he experienced toothache, red eyes, and various ailments arose simultaneously. Mengying palpated the pulse as wiry and slippery, prescribed multiple doses of gypsum-based medication, and frequently administered Danggui Longhui Wan. The new ailments healed, and his legs gradually warmed. He advised Wang to often drink persimmon cake soup to prevent future illnesses.

Yi Fang's younger brother suffered from abdominal distension and preferred warm-tonifying therapies, but there was no effect after a long time. Mengying said, "It is damp-heat; it should be cleared and transformed." He did not believe this and took Totu Dan. Initially, it seemed effective, but soon massive bleeding occurred, leading to regret. These few cases are recorded to warn those in the world who love to take miraculous drugs.

When Wang Xueshan mistakenly took "Totu Dan" last year, Mengying invited doctors to treat him until he was recovering. He then instructed him to often drink persimmon cake soup to prevent future Guan Ge (obstruction syndrome). By April of this year, his physique grew thinner day by day. Zhang Mou prescribed damp-guiding, wind-dispersing, and Qi-tonifying herbs. Mengying happened to see these prescriptions and strongly advised against using warm-tonifying methods, using the analogy: "All things shrink when exposed to fire and become plump and moist when nourished." Xueshan deeply agreed, but was bewildered by the empty words of Zhang Mou and others day and night, continuing to take tonics. It was not until autumn that Mengying was consulted again. There was hypochondriac pain, aversion to wind, distension of the whole body's collaterals, a desire to beat oneself, poor appetite, difficult defecation, and slight chills and fever in the afternoon. The pulse was wiry, choppy, and rapid; the right Cun and Guan positions were wiry, soft, and slippery. This indicated that the regulation of ascending and descending had been blocked for a long time, phlegm pathogens attacked the collaterals, and the situation of Guan Ge was about to form. Reluctantly, he prescribed: Shashen, Zhuru, Beimu, Baiwei, Qinghao, Xuanfuhua, Shihu, Zhizi, Lianshi, Lancao, Pipaye, Sigualuo, Dongguazi, Lugeng, Maogen, etc., varying the composition. After taking it, the chills and fever subsided, and hypochondriac pain decreased. Xueshan was greatly delighted and asked for another consultation. The pulse had turned harmonious, but the Liver Yin was injured by excessive planning and worrying. He feared emotional distress most, as it would surely cause complications. How could slight improvement be relied upon? He advised inviting another bright-eyed doctor. However, anger and obsession lingered, causing many triggers and frequent changes, generating new issues repeatedly. Consequently, defecation required extreme beating of the back and buttocks; upper body symptoms included vomiting phlegm and aversion to grain. It truly became the symptom of Guan Ge. Mistakenly treated with warm-dispersing and warm-tonifying methods, the tongue color became dry and purple, fluids dried up, and he died.