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A daughter of Huang Jiaolian from Beiping, just one year old, had been ill for a long time without recovery. Upon examination, I found her extremely emaciated, with fever persisting. Soon, many physicians gathered, all prescribing herbs such as Hawthorn Fruit (Shanzha), Medicated Leaven (Shenqu), Schizonepeta (Jingjie), and Saposhnikovia Root (Fangfeng), which are all digestive-promoting agents. I privately disagreed, recalling the statement in *Huangdi Neijing* (Yellow Emperor's Inner Canon): "Excess conditions are treated by purging; deficiency conditions are treated by tonifying." This girl was extremely emaciated; could this be an excess condition? However, the crowd argued loudly, making debate impossible. Three days later, I visited again. Mr. Huang said: "My daughter had severe diarrhea with yellow froth yesterday, and developed opisthotonos (backward arching of the body due to muscle spasm). I do not know why?" I replied: "This is toxicity caused by cold-natured medicines." Mr. Huang said: "Indeed. The previous prescription of Hawthorn and others was ineffective, and adding two fen of Coptis Rhizome (Huanglian) worsened the condition." The preceding physician present felt ashamed and insisted I prescribe a formula. I declined and returned home. The next day, Mr. Huang presented formulas from various doctors for my review. I saw it was Wuling San (Five-Ingredient Powder with Poria), still containing digestive and dispersing herbs. At that time, I wished to prescribe a new formula but feared obstruction by other physicians, and Mr. Huang might not fully trust me. Therefore, I annotated the original formula, clarifying which herbs were suitable and which were not, generally following Zhang Jingyue’s theory of directly saving and tonifying True Yin. Mr. Huang was convinced and told the other physicians: "My daughter has been ill for a long time; nourishing Yin must be the priority." He significantly increased Rehmannia Root (Shudi) to two qian. After two doses, the fever subsided suddenly, and the illness gradually improved. Because previous treatments had been too harsh, recovery was slow.

A neighbor and friend, Fang Yuanxing, had a son over one year old. I often saw him buying medicine with a single prescription. When asked, he said: "The child has been ill for a long time, seeing several doctors. Now another doctor has agreed to treat him exclusively. This is his prescription." Several days later, he wept and told me: "That doctor regretted his promise; my son will not survive. Do you have any method?" Upon detailed inquiry, he said: "My son has had internal heat for a long time. Recently, his qi is weak, spirit is confused, abdomen is distended, vomiting and diarrhea occur with wheezing, eyes roll upward, and life hangs by a thread." I invited myself to examine the child. The fontanelle was sunken, complexion greenish-yellow. Reviewing previous prescriptions, they consisted entirely of accumulation-resolving, dispersing, and blood-cooling herbs, contrary to the symptoms. I said: "I understand the cause." I used Lizhong Dihuang Tang (Regulate the Middle and Nourish Yin Decoction), removing Aconite Root (Fuzi) and Alisma Rhizome (Zexie), adding Goji Berry (Gouqi) and Psoralea Fruit (Guzhi). One dose brought stability; after more than ten doses, the child became robust.

My paternal nephew, nickname Wenbao, was usually robust. After measles at age one, fever persisted for half a month. He coughed frequently, touching his mouth, indicating throat pain. Days later, he slept day and night without waking. A local physician prescribed cooling and exterior-releasing herbs. After one dose, fever stopped, but the body became ice-cold. Fever then surged back; repeating the dose was ineffective. Another physician prescribed Scutellaria Root (Huangqin), Coptis Rhizome (Huanglian), and Dendrobium Stem (Shihu). Not only did the fever not resolve, but the complexion turned greenish-yellow, the three Yang channels appeared dull, severe wheezing and diarrhea occurred, and the condition became critical. Physicians were helpless. Consulting texts on rashes, all stated measles is a heat condition treated with cold herbs, which contradicted the symptoms. I tentatively used a formula to save Yin, secure the root, and gently tonify. It was vomited out immediately. Observing the child, I noted: "Abdominal rumbling indicates wind stirring; chicken-like sound in throat indicates phlegm obstruction; vomiting upon feeding, head shaking, eye rolling, shortness of breath, confusion, dull eyes, and pale face indicate terminal syndrome." I urgently summoned previous physicians, but they refused to come. Consulting books, post-measles fever with head shaking, eye rolling, vomiting, diarrhea, and confusion is identified as Slow Spleen Wind (Man Pi Feng), an untreatable condition. Yet I could not sit idle. Carefully considering, the throat noise indicated cold-phlegm. True Yang had floated outward, generating cold internally. If it were excess fire, why did Huangqin and Huanglian worsen it? Externally hot, internally truly cold. Only large acrid-hot substances could break through the cold-phlegm, explaining why previous medicines were rejected. I prepared a decoction of Aconite Root (Fuzi), Ginger (Shengjiang), and Cinnamon Twig (Rougui) to administer. My mother objected: "The child is febrile, lips are cracked and bleeding; how can Fuzi be used?" Recalling *Neijing*: "Treat false conditions oppositely." This case required acrid-hot substances to guide fire back to its source and eliminate cold stagnation. Although I removed Fuzi, I used Pepper (Hujiao) 1 qian, Cinnamon Bark (Rougui) 1 qian, and Roasted Ginger (Paojiang) 4 slices. Though seemingly mild, this appeased my mother. After administration, phlegm sounds ceased. Dragon Liver Earth (Fulonggan) water was administered, stopping vomiting. Soon, the child moved his eyes, yawned, and coughed without touching his mouth. Urination followed, with thick, turbid, purple-black urine, indicating expulsion of measles toxins. There were signs of recovery. I used Fuzi Lizhong Tang combined with Liuwei Dihuang Tang (Six-Ingredient Pill with Rehmannia), removing Alisma (Zexie) and Moutan Cortex (Danpi), adding Psoralea (Guzhi) and Goji (Gouqi). One dose eliminated the terminal syndrome. Persistent high fever remained, so I added Sour Jujube Seed (Suanzaoren), Schisandra Berry (Wuweizi), and White Peony Root (Baishao) to astringe Yin. One dose brought peace. This aligns with *Neijing*: "To treat wind, first treat blood," and the principle of using sweet-warm herbs to reduce great heat. Later analysis showed: cough and sore throat resulted from Heart Fire scorching Lung Metal; vomiting and diarrhea resulted from Spleen-Stomach deficiency-cold. Pepper, Ginger, and Cinnamon opened cold-phlegm in the throat. Dragon Liver Earth supplemented Earth to control Wood (Liver). When Wood is peaceful, wind ceases; when Earth is prosperous, Lung Metal is generated. With Lung Metal supported, Heart Fire cannot attack it, returning to the Heart. As the Monarch organ, the Heart repels pathogens. Heart and Small Intestine are interior-exteriorly related, allowing measles toxin to enter the Bladder, exiting via urine as purple-black. My brother said: "This child, after measles fever, took cooling herbs mistakenly, nearly dying. Your prescription revived him from bones, like being reborn. We renamed him Yaosheng (Medicine Born), courtesy name Peibo, to never forget."

My nephew Jun, while serving in Nanyang, had a daughter. She suffered food stagnation. Central Plains physicians invariably used Wine-processed Rhubarb Stalk (Dahuang) to purge bowels, once or twice monthly. Repeated purgation damaged her Spleen and Stomach by age two. She became extremely emaciated, with Yin deficiency night fever, sleeping with eyes open, suddenly developing Slow Convulsion (Man Jing). Quack physicians failed to recognize this deficiency syndrome, prescribing Wuling San plus 4 fen of Coptis (Huanglian). Upon swallowing, she developed Jie Xiong (Chest Binding) and muteness, dying the next day. Middle Jiao deficiency-cold aggravated by Coptis is fatal.

The son of a relative’s servant, aged two, lost his mother, fed by a wet nurse. Irregular diet caused jaundice, shortness of breath, fever, abdominal distension, and visible weakness. Physicians insisted on internal heat, administering cold herbs. Unstopping vomiting and diarrhea led to Slow Convulsion. A neighbor provided *Fu You Bian*. The father consulted a physician, who said: "Children are pure Yang bodies; how can hot herbs be used?" He took one Bao Long Wan (Dragon-Holding Pill), crushed and administered it. Before finishing, the child died.

My niece Yan Lin’s maid, aged ten, had dense measles that failed to erupt fully. After three days, she refused food. Lying in the west corridor, pale, approaching Slow Convulsion. My daughters asked Yan Lin, who said: "The maid has measles, cannot drink, has been here two days, waiting for death to bury her." Daughters suggested seeking a prescription from *Sui Sheng Bian*. Following Dabu Yuansheng Tang (Great Tonify Origin Decoction) with Aconite Root (Fuzi) 1 qian and Cinnamon Bark (Rougui) 2 qian, concentrated and administered in portions, she ate a cup of porridge after one dose. After two doses, Spleen-Stomach strengthened. Reducing Fuzi, she recovered after several doses. If measles were treated as heat with cold herbs, survival would be impossible!

Son of Cheng Gong, a scholar in Lu’an, aged nine, had chronic illness with diarrhea and convulsions, barely breathing. Physician said: "Slow Convulsion formed; even a divine physician could not help." Cheng cried for help. Classmate Song Xiaolian gave him my previously gifted *Fu You Bian*. Cheng doubted it. Song said: "No hope remains except this warm-tonic approach." Lacking Cinnamon, Song used Cassia Seeds (Guizi) 4 qian, ground and added to modified Lizhong Dihuang Tang. Administered frequently, convulsions stopped after two doses; full recovery after three. In Renzi year of Qianlong era, Song confirmed this to me in Lu’an.

Only son of Xu Gong, Prefect of Yuzhou, aged ten, constitutionally weak. Post-illness persistent high fever, repeated cooling herbs caused diarrhea, vomiting, and opisthotonos. Physicians applied cooling and exterior-releasing methods, worsening the condition. Shi Mou, Vice Prefect, requested audience. Gatekeeper said: "Young master has Slow Convulsion, dying soon, no time for visitors." Shi said: "I come for Slow Convulsion, not official business." Entered, Xu Gong asked: "Medical skill exhausted; can you save him?" Shi presented *Fu You Bian*, authored by his uncle, specifically for Slow Convulsion, differing from ancient texts. Xu Gong agreed to follow it exactly. Using Zhuhan Dangjing Tang (Expel Cold and Shake Off Convulsion Decoction) one dose, throat cold-phlegm cleared. Followed by Lizhong Dihuang Tang four doses, convulsions stopped, fever retreated, full recovery. My brother Yi Peng, then in Nanyang, knew the outline. Later, Shi Wei went to Hubei, detailing this to me. Over twenty years since Dingyou, this book has saved many. Recording these cases dispels doubts. Readers should trust it firmly to avoid errors. Above from *Fu You Bian*.