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(From Yu Jiayan's *Yi Men Fa Lv*) Treating the condition where Yang Qi is about to return, Yin-Cold has slightly diminished, and there is a slight clue to recovery, use the third decoction: Fuzi (Prepared Aconite Root), Ganjiang (Prepared Dried Ginger), Danggui (Angelica Sinensis), Rougui (Cinnamon Bark) (each 1.5 qian), Renshen (Ginseng Root), Gancao (Prepared Licorice Root) (each 2 qian), add two large bowls of water, and three slices of Wei Jiang (Simmered Fresh Ginger).

(From Yu Jiayan's *Yi Men Fa Lv*) Treating Cold Stroke after taking the first three formulas, where Yang Qi has returned, the body is warm, the complexion is lively, and the hands and feet are no longer cold. The fourth formula uses this to peacefully regulate the Ying and Wei Qi of the Zang-Fu organs. Fuzi (Prepared Aconite Root), Ganjiang (Prepared Dried Ginger), Rougui (Cinnamon Bark) (each 0.5 qian), Danggui (Angelica Sinensis), Renshen (Ginseng Root), Gancao (Prepared Licorice Root), Huangqi (Honey-fried Astragalus Root), Baizhu (Earth-fried Atractylodes Macrocephala Rhizome). Decoct until one bowl remains, then add five "wa" of honey (Note: "wa" is likely a typo or specific local unit in the original text, translated literally).

(From Yu Jiayan's *Yi Men Fa Lv*) Treating Cold Stroke after taking the previous medicines, where all symptoms have disappeared, but there is still slight stubborn phlegm in the meridians that does not clear up quickly after medication. Use the fifth formula for this. Renshen (Ginseng Root), Maidong (Ophiopogon Tuber), Shaoyao (Wine-fried Peony Root) (each 1 qian), Huangqi (Honey-fried Astragalus Root) (1.2 qian), Shengdihuang (Rehmannia Root) (2 qian), Gancao (Prepared Licorice Root) (0.7 qian), Danshen (Salvia Miltiorrhiza Root).

Fujing Baitong Tang (Aconite, Ginger, and Scallion Decoction) treats Cold Stroke with vomiting, diarrhea, cold limbs, and absence of sweat. Moxibustion with moxa cones on Guanyuan (CV4) is also required. (The point 1.5 cun below the umbilicus is named Qihai (CV6), and 2 cun is Guanyuan (CV4); the text implies warming the lower jiao). Strictly enforce the warming measures to prevent the burial of faint Yang Qi, which leads to frozen and cracked skin, anhidrosis, and loss of spirit. Urgently use Fuzi (Prepared Aconite Root) and Ganjiang (Prepared Dried Ginger), add Congbai (Scallion White) to disperse cold, and add Zhuyezhi (Pig Bile) to guide into the Yin aspect. However, fearing the medicinal power may be insufficient, apply external heat therapy (ironing/warming) and moxibustion to attack from both inside and outside, thereby breaking the solidified cold. Any delay will result in failure to save the patient.

Profuse sweating (Po Han) indicates Yang escaping externally; call forth Fuzi (Prepared Aconite Root) and Ganjiang (Prepared Dried Ginger) (named Fujing Tang). This is the previous formula minus Congbai (Scallion White), focusing solely on restoring Yang without dispersing the exterior. (If the person's Kidney Yang was originally deficient and pores were loose, Yin excess internally forces Yang to escape externally, causing profuse sweating and stiffness of the spine and neck. In this case, using Fuzi, Ganjiang, and Pig Bile should NOT include Congbai or external heating, as it might aid dispersion, causing Qi to escape with sweat and preventing Yang from returning internally. One should stop the sweating, administer the medicine abruptly, and subsequently protect the pores. Otherwise, Yang may rebound excessively.) Cold pathogen entering the interior must damage Ying Blood; Danggui (Angelica Sinensis) and Rougui (Cinnamon Bark) are suitable to assist.

Fujing Guigui Tang: Fuzi and Ganjiang specialize in restoring Yang, but the invading Cold Pathogen first damages Ying Blood. Therefore, after taking Fujing Tang, one must add Danggui and Rougui to drive out Cold from the Ying level, ensuring the medicine matches the disease.

To allow Yang Harmony to prevail and Yin decline slightly, irrigate with Fujing Guigui Rengan Tang. (After taking it, when Yang is about to return and Yin-Cold slightly diminishes, one must add Renshen (Ginseng Root) and Gancao (Prepared Licorice Root) to regulate Yuan Qi and transport nutrients, securing victory in the command tent. Otherwise, the harsh nature of Ginger and Aconite acting directly upwards will ruin previous efforts.)

When diarrhea stops, the body warms, and sweat ceases, follow the Xingwen Pingbu Tang (Acrid-Warm Neutral Tonifying Decoction) principles. Add Baizhu (Atractylodes Macrocephala Rhizome), Shaoyao (Peony Root), and Wuweizi (Schisandra Berry) to the previous formula; do not interrupt the balance of Yin and Yang. (After taking Fujing Guigui Rengan Tang for two or three doses, if one feels the Yang Ming Qi is active, movement is light, and spirits are joyful, continue with a large group of neutral tonifying herbs like Wuweizi, Shaoyao, and Baizhu to balance Yin and Yang. Do not stop. Just as a prodigal son returns, if one is lax in post-treatment care, previous efforts will be wasted.)

If there is slight phlegm in the meridians, nourish Yin to dissipate the phlegam. Use Ghanhan Buqi Tang (Sweet-Cold Qi-Tonifying Decoction). (After using neutral tonification, the intent is to lay down arms and promote culture. If stubborn phlegm remains in the meridians, only Sweet-Cold herbs that assist Qi and open blockages should be used, avoiding Acrid-Heat herbs that cause stagnation. Acrid-Heat herbs were used initially out of necessity due to their toxicity; now that Yang is stable, one should nourish Yin. Thus, only Sweet-Cold Qi-tonifying herbs should be used for slow regulation, which is the proper post-treatment strategy.)

Six formulas are compiled in sequence, with Jiayan expending deep effort in compiling them. Although Changsha Zhang Zhongjing's *Cu Bing Lun* (Treatise on Sudden Diseases) is lost, seeking from here allows one to understand more than half. (Han Dynasty Master Zhang Zhongjing wrote the *Shanghan Lun* (Treatise on Cold Damage) in ten volumes transmitting Yang diseases, and *Cu Bing Lun* in six volumes treating sudden Yin diseases. Unfortunately, *Cu Bing Lun* was lost in his own time. Later generations never elucidated it. Only Han Zhihe made slight discoveries in the field of Cold Stroke, teaching people to urgently use Fuzi and Ganjiang, making him a disciple of Zhongjing. In the late Qing, Yu Jiayan discussed Zhongjing's *Shanghan Lun*, advocating restoration of Yang for Yin diseases. He further wrote *Yin Bing Lun*, explaining profound mysteries. Observing his six formulated prescriptions, they are detailed and align deeply with Zhongjing's heart-method. Since *Cu Bing Lun* is lost and hard to verify, extracting methods for deficiency-cold from *Shanghan* and *Jingui* shows that treatments for hot and miscellaneous diseases use such methods; thus, the theory of treating sudden Cold Stroke can be trusted. Alas! Sudden invasion of Cold Pathogen results in weak Yang and excess Yin, a critical state. Without the fierce power of Ginger and Aconite charging through gates, how could one swiftly sweep away Yin miasma and restore Yang? How many out of a hundred would survive? Recently, cholera has prevailed, leading to cold limbs, hidden pulse, blue face, hoarse voice, and death by restlessness. Even in summer heat, is this not a critical Three-Yin syndrome caused by Yin pathogen entering the interior? Moved by this, I compiled Yu's formulas and theories, condensed them into songs, to honor his merit, observe worldly gains and losses, and warn myself.)