（本经上品）
审形状辨土地。此不独具山全体，更藉外缘以相资也。具山全体，故功力勇悍乃尔。
【气味】甘温，无毒。
【主治】主咳逆上气，明目益精，安五脏，通百节，利九窍，下乳汁。
【核】曰∶生少室山谷及太山。第一出始兴者佳，江陵及东境名山石洞中亦有。按范成
大桂海志所说甚详。云桂林接宜、融山洞石穴中，钟乳甚多。仰视石脉涌起处，即有乳床，
白如玉雪，乃石液融结所成者。乳床下垂，如倒生山峰，峰端渐锐且长，若冰柱，柱端轻薄，
中空如鹅翎。乳水滴沥不已，且滴且凝，此乳之最精者，以竹管仰承取之。而炼治家又以鹅
管之端，尤轻明如云母爪甲者为胜。孙思邈曰∶乳石必须土地清白，光润如罗纹、鸟翮、蝉
翼，一切皆成白色者可用；其非土地者慎勿服之，杀人甚于鸩毒。别本注云∶凡乳生深洞幽
穴者，皆龙蛇潜伏之处，或袭龙蛇毒瓦斯，或洞口阴阳不均，或通风气，或黄色赤色，乳
无润泽，或煎炼火色不调，一煎以后，不复易水，服之令人发淋。又乳有三种∶一种石乳，
其洞纯石，石津相滋，阴阳交备，具蝉翼纹者，其性多温；一种竹乳，其洞遍生小竹，竹津
相杂，石状如竹，其性多平；一种茅乳，出茅山，其山土石相杂，遍生茅草，茅津相滋，形
质润滑，其性多寒，皆以光泽者为善。余处亦有，不可轻信。雷公曰∶凡使勿用头粗浓，并
尾大者，为孔公石，不用。色黑及经大火惊过，并久在地上收者，与曾经药物制者。须要鲜
明轻薄，而有光润，如鹅翎筒子者乃佳。修治，钟乳八两，用沉香、零陵香、藿香、甘松、
白茅各一两，水煮过，再煮汁，方用煮乳，一伏时，漉出。以甘草、紫背天葵各一两，同煮，
漉出拭干，缓火焙之，入臼杵粉，筛过，入钵中。令有力少壮者二三人，不住手研三日夜。
然后以水飞澄，罩以绢笼，日中晒干，入钵再研三万遍，乃以瓷盒收之。太清经炼钟乳法∶
取好末置金银器中，瓦一片，密盖，勿令泄气，蒸之，自然化作水也。之才曰∶蛇床为之使。
恶牡丹、玄石、牡蒙。畏紫石英、 草。忌羊肉。时珍曰∶亦忌参、术，犯之多死。土宿
真君曰∶钟乳产于阳洞之内，阳气所结，服之可柔五金。麦门冬、蒜、韭实、胡葱、胡荽、
猫儿眼，皆可服之。
（经云∶水势劣火，结为高山，钟乳本具水火二大矣。则乳质全类似水，而勇悍独专，
宁非火胜水劣乎。修治，水煮，仍交水火以济之。但煮则水胜于火，所以少平勇悍也。今世
多用火 ，反助长其勇悍，故每多石毒燃烧之患。）
先人云∶五脏安和，窍节通利，即地形仙矣。此属借资，大须保任，久与相习，乃成自
然。
【 】曰∶乳乃石之灵液，具山之全体者也。顾山体有清浊，而乳之优劣因之。如妇人
异质，则钟乳之浓薄，与味之甘淡，气之腥香冷暖，其滋益婴儿与否，亦自有辨。故钟乳先
须论土地，再审形状，庶几得之，唯天地之气，钟于名山而乳凝焉。观其主治，一一可想，
如肺系填塞胀满，则不能分布诸气，故咳逆上气，钟乳虚中，宛若肺系，何患填塞胀满，此
石液所钟，光润莹彻，故明目，目亦水液所钟，洞见明暗，此石中精髓，点滴不穷，故益精
髓之体。此艮山之液，能益真阴。然五脏至阴，须宁静濡润，乃得安和，若通百节，利九窍，
下
[Shangpin Category of the Classic of Materia Medica]
Examine the shape and distinguish the origin. This is not only because it possesses the entirety of the mountain's characteristics, but also relies on external conditions for mutual support. Because it possesses the entirety of the mountain's characteristics, its medicinal power is so brave and fierce.
[Flavor and Property] Sweet, warm, non-toxic.
[Indications] Mainly treats cough with rebellious Qi (Ke Ni Shang Qi), brightens the eyes, benefits essence (Jing), calms the five Zang organs (Wu Zang), unblocks all joints (Bai Jie), facilitates the nine orifices (Jiu Qiao), and promotes lactation.
[Verification] Says: It grows in the valleys of Mount Shaoshi and Mount Tai. The best quality comes from Shixing; it is also found in the stone caves of famous mountains in Jiangling and the eastern regions. According to Fan Chengda's "Guanghai Zhi", the description is very detailed. It states that in the mountain caves and stone holes connecting Guilin, Yizhou, and Rongzhou, there are many Zhongru (Stalactite). Looking up at where the stone veins surge, there are "milk beds" (Ruchuang), white as jade and snow, formed by the melting and condensation of stone fluid. The milk bed hangs down like an inverted mountain peak, with the tip gradually becoming sharp and long, resembling an icicle. The tip of the icicle is thin and light, hollow like a goose feather quill. Milk drops continuously, condensing as they drip; this is the most refined Zhongru, collected by holding bamboo tubes upward to catch them. Those who refine medicines consider the end of the "goose tube" type, which is especially light and clear like mica fingernails, to be superior. Sun Simiao said: Zhongru must come from land that is clean and pure, lustrous and moist like brocade patterns, bird feathers, or cicada wings, and entirely white ones can be used; those not from such land should never be taken, as they kill more swiftly than poison. Another edition notes: Any Zhongru growing in deep caves and secluded holes is a place where dragons and snakes lurk; some may absorb dragon/snake toxic vapors, some have uneven Yin and Yang at the cave mouth, some are affected by wind currents, or appear yellow/red without luster, or were improperly calcined with inconsistent fire, or not changed water after one boiling; taking these causes Lin syndrome (strangury). Furthermore, there are three types of Zhongru: One is Stone Ru (Shi Ru), where the cave is pure stone, stone juices nourish each other, Yin and Yang are complete, and those with cicada-wing patterns tend to be warm in nature; One is Bamboo Ru (Zhu Ru), where small bamboos grow throughout the cave, bamboo juices mix with stone, the stone resembles bamboo, and tends to be neutral in nature; One is Thatch Ru (Mao Ru), produced in Maoshan, where the mountain has mixed soil and stone with abundant thatch grass, thatch juices nourish each other, the form and texture are smooth and lubricating, and tends to be cold in nature. All are best when lustrous. Others exist elsewhere, do not trust them lightly. Lei Gong said: When using Zhongru, do not use those with thick heads or large tails, as these are Konggong Shi (Hole Public Stone), which are useless. Do not use those that are black, exposed to intense fire, stored underground for a long time, or previously processed with drugs. They must be fresh, bright, thin, light, and lustrous, resembling goose feather quills, which are excellent. Processing method: Take 8 liang of Zhongru, boil with 1 liang each of Chenxiang (Aquilaria Wood), Linglingxiang (Lingnan Agastache), Huoxiang (Patchouli), Gansong (Nardostachys), and Baimao (Imperata Rhizome) in water. Boil again to extract juice, then use this juice to boil the Zhongru for one shichen (2 hours), remove and drain. Then boil with 1 liang each of Gancao (Licorice Root) and Zi Bei Tian Kui (Oxalis corymbosa) together, remove, wipe dry, and slow-roast. Pound into powder in a mortar, sieve, and put into a bowl. Have two or three strong young men grind continuously for three days and nights. Then clarify by water levigation, cover with silk gauze, dry in the sun, pound again in a bowl for 30,000 times, and store in a porcelain box. Taqing Jing method for refining Zhongru: Take fine powder, place in gold or silver vessel, cover tightly with a tile to prevent gas leakage, steam it until it naturally turns into water. Xu Zhicai said: Shechuangzi (Cnidium Fruit) acts as an assistant drug. It is incompatible with Mudan (Tree Peony Root Bark), Xuan Shi (Black Stone), and Mumeng (Dioscorea Polystachya). It fears Zhiyanshi (Purple Quartz) and [missing character] Cao. Avoid mutton. Li Shizhen said: It also conflicts with Renshen (Ginseng) and Baizhu (Atractylodes Macrocephala); violating this often leads to death. Tusuxen Jun said: Zhongru is produced inside Yang caves, condensed from Yang Qi; taking it can soften the five metals. Maimendong (Ophiopogon Tuber), garlic, leek seeds, Hucong (Allium hookeri), Huyi (Coriander), and Mao'er Yan (Aconitum carmichaelii side root) can all be taken with it.
(The Classic says: Water power is inferior to Fire, condensing to form high mountains. Zhongru inherently possesses both Water and Fire elements. Since the substance of the ru resembles water, yet its brave/fierce nature is exclusive, does this not indicate Fire overcoming Water? In processing, boiling with water still involves the interaction of Water and Fire to balance it. However, boiling makes Water superior to Fire, thus slightly moderating its fierce nature. Nowadays, people mostly use calcination/fire, which instead enhances its fierceness, leading to frequent hazards of stone toxicity and burning sensations.)
My late father said: When the five Zang organs are harmonious and orifices/joints are unblocked, one achieves a terrestrial paradise. This belongs to borrowing external aid; one must carefully preserve and nurture it. Only through long-term habituation can it become natural.
[Analysis] Says: Ru is the spiritual fluid of stone, possessing the entirety of the mountain's characteristics. However, since mountain bodies vary in purity and turbidity, the quality of Ru varies accordingly. Just as women differ in constitution, so too do the thickness of Zhongru, the sweetness or blandness of taste, and the fishy/fragrant, cold/warm nature of its Qi; whether it nourishes infants effectively also has its distinctions. Therefore, Zhongru must first be evaluated by origin, then by shape, to ensure acquisition of the good. Only the Qi of Heaven and Earth, concentrated in famous mountains, condenses into Ru. Observing its indications, one can deduce them one by one: For instance, if the lung system is blocked and distended, it cannot distribute Qi, causing cough and rebellious Qi. Zhongru is hollow and void, resembling the lung system; how could it suffer from blockage and distension? It is concentrated stone fluid, lustrous and transparent, thus brightening the eyes. The eyes are also concentrated water fluid, seeing clearly in light and dark. This is the marrow/essence of the stone, inexhaustible drop by drop, thus benefiting the body of essence. This is the fluid of Gen Mountain (Mountain Trigram), able to benefit True Yin. However, the five Zang organs belong to Extreme Yin, requiring tranquility and moisture to be harmonious. If it unblocks all joints, facilitates the nine orifices, and lowers...