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The two fires fail to illuminate each other. Furthermore, compared to the celestial phenomenon of intense summer heat, the qi of summer-heat resides in the Great Void and is invisible, unlike the transformation of clear cold and yin-cold, which has clouds, mist, wind, and fog as tangible manifestations. Therefore, its pulse, besides being rapid and large during the paroxysm, is like that of a healthy person when not attacking or after the attack. The body feels no aversion to cold, only heat; this also refers to the period before and after the fever. The bone joints are the "Kan Marsh" (a reservoir for yin fluids) of the human body, where yin fluids pour in. When pathogenic heat lodges there and agitates it, pain occurs. When the supply of body fluids is insufficient, pain and vexation occur together. Yang, lacking yin to anchor itself, constantly tends to flare upward and rush up, causing vomiting. The reason for prescribing Baihu Jia Guizhi Tang (White Tiger plus Cinnamon Twig Decoction) is that the previous clause did not state that the pathogen lodges between the muscle layers? The muscle layers belong to the Yangming channel. Therefore, Shigao (Gypsum Fibrosum), which is acrid-cool and targets the Stomach, serves as the principal herb. It is supported by Gancao (Licorice Root), which is floating and slow, to uphold it. Zujingmi (Rice Grain), which is sweet-warm and good at replenishing Stomach fluids, is added as an assistant to nourish the yin in the Stomach. Then, relying on Zhimu (Anemarrhenae Rhizoma), which moistens the Lungs, to slowly guide the action upward. Thus, the original Baihu Tang acts like cool rain soaking into dry grass, while adding Guizhi (Cinnamomi Ramulus) acts like autumn wind sweeping away heat to relieve vexation. As for the so-called pathogenic qi hiding halfway within the Heart, it combines with the next clause's Shuqi San (Vitex Powder) for treatment, possessing profound significance. Zhang Zhongjing's method of healing is indeed unfathomably subtle yet meticulously orderly.

Malaria manifesting predominantly with chills is named Pin Malaria (Yin Malaria). It is treated with Shuqi San.

Shuqi San Formula: Shuqi (Washed to remove fishy odor), Yunmu (Burned for two days and nights), Longgu (Equal parts).
The above three herbs are pounded into a powder. Before the onset of symptoms, take half a Qianbi dose with Jiangshui (Sour Rice Water). For Wen Malaria (Warm Malaria), add half a Qianbi of Shuqi. At the time of impending onset, take one Qianbi dose.

The duration of chills is long and the duration of fever is short, with chills exceeding fever; hence it is called "excessive chills," not merely meaning chills without fever. According to the *Neijing*'s discussion on Cold Malaria, injury by summer-heat in summer causes sweating and opening of the couli (pores). Encountering biting cold then allows the cold to hide within the couli and skin. Injury by wind in autumn exacerbates the cold, resulting in disease formation. Cold is a Yin pathogen; Wind is a Yang pathogen. Injury by cold first, then by wind, leads to chills preceding fever. I believe cold is internal and wind is external; cold is the host and wind is the guest, thus chills exceed fever. The term Pin Malaria in the *Jinkui Yaolue* corresponds to the Cold Malaria mentioned in the classics. Popular interpretations erroneously erase the character "excessive" from "excessive chills," defining Pin Malaria as chills without fever, which is incorrect. Pathogenic malaria invariably involves fever, differing only in degree. Moreover, Pin/Peng (female/male) refers to the yin/yang of birds and beasts, analogous to men and women. If one were to argue that because it is called Pin Malaria, there is no fever, would one claim that women's bodies completely lack Yang warmth? The intent behind prescribing Shuqi San is based on the principle that Heart Qi governs Summer and Lung Qi governs Autumn, reflecting the correspondence between the Five Zang organs and the four seasons. Now, summer injury by summer-heat damages Heart Yang; autumn injury by wind damages Lung Qi. With both Heart Yang and Lung Qi injured superiorly, they cannot disperse wind and cold, leading to the Yin Malaria characterized by excessive chills and scanty fever. The treatment principle is simply to raise the Yang Qi from the Gate of Vitality (Mingmen) upward, allowing the Qi to evenly fill the space between the Heart and Lungs. Once the Great Qi rotates, the pathogen disperses. Therefore, heavy mineral substances like Yunmu (Muscovite) and Longgu (Fossile Ossis Mastodi) are used to constrain Shuqi (Viticis Radix et Caulis) to the Lower Jiao, enabling it to warm, ascend, and descend. Yunmu's nature: in cloudy weather, it emits qi to form clouds and ascends well; in clear weather, it absorbs qi into clouds and retains well. Burning it for two days and nights uses fire power to override the clear weather's creation, utilizing its ability to absorb rather than emit clouds, specifically to capture wind-cold qi. Longgu was previously mistaken by predecessors as dragon or snake shed skin, but it is actually the stone bone of dragon veins, facilitating communication with the spiritual pathways of mountains and rivers. In medicine, it is a true substance for the Hand-Shaoyin Pericardium/Heart to gather spirit and condense qi. Shuqi, according to Li Dongyuan, tonifies Heart Qi from above, possessing the speed of "flying needles and running threads." Clearly, heavy minerals are first used to sink Shuqi downward. Then, relying on the natural tendency of Longgu and Shuqi to rise, Yang Shen (Spirit) is raised from the Lower Jiao to fill the Heart, treating the symptom of excessive chills. Subsequently, Yunmu, relying on its natural tendency to descend, draws Yin pathogenic qi from the Upper Jiao back to emptiness, treating the root of Yin Malaria. Using equal parts ensures balanced forces without mutual restriction, allowing each herb to exert its nature. Taking the medicine before onset takes advantage of the fact that wind-cold shadows have not yet risen, allowing Yang light to fill the diaphragm, forcing Yin pathogen downward, making it easier for Yunmu to absorb it nearby. As for Warm Malaria, this powder is also prescribed, with an additional half Qianbi of Shuqi. This is a realm of wonder; I do not know how Zhang Zhongjing derived such efficacy. The pathogenic qi of Warm Malaria hides in the Heart. Baihu Jia Guizhi Tang treats its residence in the muscle layers but does not reach its hidden location. Therefore, Shuqi, which flies into the Heart Meridian, is used as the principal herb in half dosage. Longgu entering the Hand-Shaoyin channel aligns with its nature, aided by Shuqi's driving force, ensuring rapid entry into the Heart. Shuqi and Longgu work in harmony to serve the Heart Master. Consequently, Yunmu floats upward. Yunmu reversely sucks Yin Essence to moisten upwards, while Longgu lifts Kidney Qi to assist. Thus, the condition of isolated Yin and solitary Yang emission can be balanced. Finally, Shuqi scatters the hidden pathogen with its flying nature, resolving symptoms like shortness of breath and vexation. One decoction and one powder treat the exterior and interior simultaneously. Would the Warm Malaria, characterized by heat without cold among the Dan Malaria types, not melt like ice? Taking it at the time of impending onset is because upon onset, the hidden pathogen fully emerges, allowing for complete removal without residue.