石脂揭两石中取之。邹氏云∶两石必同根歧出而相并，脂者粘合两石之胶，故所治皆同
本异趋而不相浃之病，得此乃汇于一处，专力以化之。仲圣所用石脂四方，固与邹说符合。
刘潜江不以东垣、海藏、濒湖、仲醇专主收涩为然，就本经补髓益气鬯发其义，虽不如邹氏
之亲切证明，而所见自超。抑愚窃有以伸之∶别录于赤石脂曰补髓好颜色，则其补髓确是脑
髓，与白石脂之补骨髓有别，本经且主头疡；何东垣但以为性降乎。夫髓生于精，精生于谷
，谷入气满淖泽注于骨。骨属屈伸泄泽，补益脑髓，是中土者生精化髓之源也。而石脂味甘
大温，补益脾胃，质粘能和胃阴，性燥复扶脾阳。其所以上际，则辛入肺为之。所以至脑，
则酸入肝为之。（外台述删繁论凡髓虚实之应主于肝胆）石脂确有补脑髓之理，千金赤石脂
散，治冷冻饮料过度，致令脾胃气弱，痰饮吐水无时，本事方云试之甚验，盖即邹氏所谓联合其
涣散者，谓石脂为胃药非脾药可乎。夫下之精秘，则上之髓盈。石脂补髓，亦半由于秘精。
秘精易而补髓难，故本经别录，皆于补髓上冠以久服字。千金羌活补髓丸不收石脂，而无比
山药丸，曰此药通中入脑鼻必酸痛勿怪。入脑自指石脂，而石脂未尝专任，可知虚损之难疗
而无近效也。
赤石脂是从两块石头中间开采出来的。邹氏说：这两块石头必定是同一根茎分叉而出并排生长，所谓的“脂”，就是粘合这两块石头的胶状物，所以赤石脂所治疗的病症，都是原本路径不同、互不相通的疾病，得到这种药后，才能将这些分散的病邪汇聚到一处，集中力量去化解它们。张仲景所用的四个含有石脂的方剂，确实与邹氏的说法相符。
刘潜江不认同李东垣、张元素（海藏）、李时珍（濒湖）、王好古（仲醇）等人专门主张赤石脂具有收敛固涩的作用，而是依据《神农本草经》中关于补髓益气的记载来阐发其深层含义。虽然他的论述不如邹氏那样有确凿的证据支持，但见解自然高超。
我私下里想进一步补充说明：《名医别录》对赤石脂记载有“补髓、改善面色”的功效，那么它所说的补髓确切是指脑髓，这与白石脂所补的骨髓是有区别的，《神农本草经》还提到它能治疗头部的疮疡；为什么李东垣仅仅认为它的药性是下降的呢？
骨髓由精生成，精由水谷化生，水谷进入人体后，气机充盈，变得浓稠润泽并注入骨骼。骨骼负责屈伸运动，排泄出润泽之气，进而补益脑髓，这是中焦脾胃作为生成精微和化生骨髓的源头。而赤石脂味甘、性大温，能补益脾胃，其质地粘稠能够调和胃阴，其性燥又能扶持脾阳。它之所以能上达至肺，是因为辛味入肺的缘故；它之所以能到达脑部，是因为酸味入肝的缘故。（《外台秘要》在删减繁冗的理论中指出，凡是髓的虚实变化，主要取决于肝胆）。赤石脂确实有补益脑髓的道理。《千金方》中的赤石脂散，用于治疗因过度食用冷冻饮料，导致脾胃气弱，痰饮内停，不时呕吐清水的情况，《本事方》说试用非常有效，这大概就是邹氏所说的联合涣散病邪的意思。可以说赤石脂是胃的药，而不是脾的药吗？
下部的精气秘藏，则上部的脑髓充盈。赤石脂补髓，也有一半原因在于它能秘藏精气。秘藏精气相对容易，而补益脑髓较为困难，所以《神农本草经》和《名医别录》都在补髓功效前加上“久服”二字。《千金方》中的羌活补髓丸没有收录赤石脂，而无比山药丸中说：“此药通中入脑鼻必酸痛勿怪。”这里“入脑”指的就是赤石脂，而赤石脂并未被单独重用，由此可知虚损之症难以治愈且没有近效。
Chishizhi (Red Halloysite) is extracted from between two stones. Zou stated: "These two stones must grow out from the same root, branching and lying side by side. The 'zhi' (grease/glue) refers to the substance that binds these two stones together. Therefore, the diseases treated by Chishizhi are all those where the pathological paths are distinct and do not interpenetrate; with this medicine, they can be gathered into one place and concentrated efforts used to resolve them." Zhang Zhongjing's use of four formulas containing Shizhi indeed aligns with Zou's theory.
Liu Qianjiang disagreed with Li Dongyuan, Zhang Congzheng (Haicang), Li Shizhen (Binhu), and Wang Haogu (Zhongchun), who exclusively emphasized the astringent properties of Chishizhi. Instead, Liu elaborated on its meaning based on the *Shennong Bencao Jing*'s description of tonifying marrow and benefiting Qi. Although his explanation lacked the direct evidence provided by Zou, his insights were naturally superior. I would like to further elaborate: The *Mingyi Bielu* states that Chishizhi "tonifies marrow and improves complexion." Thus, the "marrow" it tonifies specifically refers to brain marrow, which differs from the bone marrow tonified by Baishizhi (White Halloysite). Furthermore, the *Shennong Bencao Jing* mentions it treats head ulcers; why did Li Dongyuan merely consider its nature as descending?
Marrows are generated from Essence (Jing), and Essence is generated from Grain (food). When grain enters the body, Qi becomes abundant, transforming into a thick, moistening fluid that pours into the bones. Bones govern flexion and extension, excreting moisture to supplement brain marrow. This indicates that the Middle Jiao (Spleen and Stomach) is the source of generating Essence and transforming Marrow. Chishizhi has a sweet taste and a great warm nature; it tonifies the Spleen and Stomach. Its sticky texture harmonizes Stomach Yin, while its dry nature supports Spleen Yang. It reaches the upper region because Pungent flavors enter the Lung. It reaches the brain because Sour flavors enter the Liver. (*Waitai Miyao*, in its discussion on the deficiency and excess of marrow, states that marrow conditions are primarily governed by the Liver and Gallbladder). Chishizhi indeed possesses the rationale for tonifying brain marrow. In *Qianjin Fang*, the Chishizhi San formula treats excessive consumption of cold drinks, which weakens Spleen and Stomach Qi, leading to Phlegm-Fluid retention and frequent vomiting of clear water. *Ben Shi Fang* notes that trials show this to be very effective. This corresponds to what Zou described as uniting scattered pathogens. Can we say Chishizhi is a medicine for the Stomach rather than the Spleen?
When Essence is secured at the lower part, Marrow fills at the upper part. Chishizhi's ability to tonify marrow is partly due to its ability to secure Essence. Securing Essence is easier than tonifying Marrow; therefore, both the *Shennong Bencao Jing* and *Mingyi Bielu* precede the mention of tonifying marrow with the phrase "long-term administration." The Qianghuo Buisui Wan in *Qianjin Fang* does not include Chishizhi, whereas the Wubi Shanyao Wan states: "This medicine penetrates the middle and enters the brain; nasal pain will occur, do not be surprised." Here, "entering the brain" refers to Chishizhi. Since Chishizhi was not used alone, it reveals that treating deficiency injuries is difficult and yields no immediate results.