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It is well known that Magnetitum (Cishi, 磁石) benefits the Kidney Qi. However, the *Shennong Bencao Jing* (Divine Farmer's Materia Medica) specifically states it primarily treats Zhou Bi (Generalized Bi Syndrome). Bi syndrome is a disease caused by the mixed invasion of Wind, Cold, and Dampness pathogens, and does not necessarily stem from Kidney deficiency. What, then, is the intent of the classic text?

I have extensively examined medical formularies and realized that Magnetitum can attract and unblock all kinds of stagnant and obstructed Qi. When applied externally, it draws inward, similar to using Sheng Yao (Calomel or similar purgative/mineral drugs for extraction) to draw out toxins, or inserting a needle into the throat (as in emetic therapy). By analogy with these cases, the principle of treating Bi syndrome becomes clear. The obstruction of the meridians by Wind, Cold, and Dampness leading to Bi syndrome is also a disease of stagnation; thus, it requires Magnetitum to attract and unblock it.

However, ancient formulas rarely use it directly according to the classic text. Yet, if we deduce the principle of "Zhou" (circulation/flow), any site of stagnation is essentially an external manifestation of Bi Qi flow. Therefore, practitioners need not rigidly adhere to the literal text but will naturally align with the classic's intent. This further clarifies the reason for benefiting the Kidney: The Heart and Lungs govern exhalation, while the Liver and Kidneys govern inhalation. Substances with an "attracting" nature harmonize with conditions characterized by a preference for "inhalation." Deficiency states become solidified through this attracting action; thus, calling it beneficial to the Kidney is appropriate. It differs from general tonics like Dioscoreae Rhizoma (Shanyao, 山药) and Rehmanniae Radix (Dihuang, 地黄). Clinicians must examine this carefully.

I often see patients with deficiency in both the upper and lower jiao presenting with cough, asthma, and hemoptysis. Physicians use Magnetitum, which gradually leads to Lung Atrophy and eventually death. This error stems from damaging the Upper Jiao by misusing its "attracting" property, yet no physician realizes this, which is lamentable.

Case Note: Zhang Zhongjing’s works do not mention this herb because his prescriptions were designed for Shanghan (Cold Damage) diseases. His original work did not separate the *Jingui Yaolue* (Essential Prescriptions of the Golden Cabinet); rather, the *Jingui Yaolue* discusses miscellaneous diseases related to Cold Damage. Since Cold pathogens enter from the exterior to the interior, one should not administer Magnetitum to draw them from the interior back to the exterior. Hence, it is omitted.

Regarding the properties and effects of Ginseng Radix et Rhizoma (Renshen, 人参), Chen Xiuyuan’s analysis in *Bian Xin Fang Ba Zhen* (Analysis of New Formulas in Eight Arrays) was incomplete. I posit that when Zhang Zhongjing used Renshen for pulse loss and blood loss, it was not because Renshen generates blood vessels directly, but to cultivate the source from which blood vessels arise. The Spleen governs transporting fluids for the Stomach. Fluids and Blood are of the same category; if fluid transport fails, blood volume decreases. Both fluids and blood are generated by Yuan Qi (Primordial Qi), which resides primarily in the Spleen. Renshen specifically tonifies the Spleen. When Spleen function is robust, Qi and fluids become abundant, curing pulse and blood loss. Thus, Renshen’s tonification of the Spleen is essentially its cultivation of Yuan Qi. Because Renshen cultivates Yuan Qi, it benefits Yang deficiency by augmenting Qi, as seen in Sizijunzi Tang (Four Gentlemen Decoction). It benefits Yin deficiency by conserving fluids, as seen in Renshen Baihu Tang (Ginseng White Tiger Decoction).

Furthermore, Renshen is contrary to Radix et Rhizoma Imperatae (Dahuang, 大黄 - *Note: Context implies Rhubarb/Dahuang despite typo in source or specific theoretical opposition*). Dahuang’s function is specifically to purge the Stomach. The Stomach is the gathering place of all things; one who purges the Stomach can purge what the Stomach governs. Renshen’s function is specifically to tonify the Spleen. The Spleen is the mother of all meridians; one who tonifies the Spleen can tonify what the Spleen governs. Extending this logic, Dahuang purges everything, and Renshen tonifies everything. This principle applies to all universal medicines.